KR20220147160A - Plastic case with electromagnetic wave shield and antibacterial function and manufacturing method of plastic case using waste plastic thereof - Google Patents

Abstract

The present invention relates to a plastic case having electromagnetic wave shielding and antibacterial functions, and specifically, the plastic case contains a synthetic resin and a functional material, wherein the synthetic resin includes at least one of polypropylene, polycarbonate, thermoplastic polyurethane, and silicone, the functional material contains a first functional material including at least one of graphite, graphene and carbon nanotubes, and a second functional material containing at least one of silver, copper, manganese, zinc and platinum.

Description

A plastic case with electromagnetic wave shielding and antibacterial functions and a manufacturing method of a plastic case using waste plastic

The present invention relates to a plastic case having an electromagnetic wave shielding and antibacterial function and a method for manufacturing a plastic case using waste plastic, specifically, including an electromagnetic wave shielding material and an antibacterial material in a case of a device in which a large amount of electromagnetic waves and bacteria are detected In order to provide a plastic case to which an electromagnetic wave shielding function and an antibacterial function are given, it is particularly related to a technology for promoting resource circulation by allowing waste plastic to be utilized when manufacturing such a plastic case.

With the development of portable electronic devices, modern people often carry one or more portable electronic devices.

In particular, in recent years, the types of portable electronic devices possessed by modern people are diversifying into smartphones, tablet PCs, wireless earphones, and the like. In addition to this, there are many cases in which a separate case is provided to prevent contamination by various foreign substances.

On the other hand, these cases are mostly distributed based on light and durable plastic materials, and to meet the various needs of consumers, not only design elements but also cases with functional elements are being released one after another.

As an example, in Korean Utility Model Registration No. 20-0467426, an electromagnetic wave shielding member corresponding to the area of the mobile phone is embedded in the front of the rear cover facing the mobile phone as a thin film or mesh, thereby shielding the electromagnetic waves emitted from the portable electronic device. A technology for a mobile phone case is disclosed.

However, as described above, the prior art has a problem in that the configuration of the case increases in the form in which the electromagnetic wave shielding member is embedded in a thin film or mesh. , there was a problem causing deformation, etc.

Accordingly, the present invention provides a plastic case with an electromagnetic wave shielding function and an antibacterial function by extrusion molding including a case manufacturing raw material, an electromagnetic wave shielding material and an antibacterial material in manufacturing a case for a device in which a large amount of electromagnetic waves and bacteria are detected The first purpose is to

In addition, a second object of the present invention is to provide a method for manufacturing a plastic case that promotes resource circulation by utilizing waste plastic in manufacturing a plastic case including electromagnetic wave shielding and antibacterial functions, and reduces manufacturing cost. have.

In order to achieve the above object, the plastic case with electromagnetic wave shielding and antibacterial function according to an embodiment of the present invention includes a synthetic resin and a functional material, the synthetic resin is polypropylene (PP), polycarbonate (Polycarbonate, PC), thermoplastic polyurethane (Thermoplastic Poly Urethane, TPU), and at least one of silicon (Silicon, Si), the functional material is, graphite (Graphite), graphene (Graphene), carbon nanotubes (Carbon NanoTube, CNT) characterized in that it comprises a first functional material comprising at least one of, and a second functional material comprising at least one of silver, copper, manganese, zinc and platinum.

The component ratio of the synthetic resin, the first functional material, and the second functional material is 75 to 90% by weight of the synthetic resin, 3 to 15% by weight of the first functional material, and 3 to 15% by weight of the second functional material, based on 100% by weight of the total. It is preferable to include 2 to 10% by weight.

On the other hand, the plastic case including electromagnetic wave shielding and antibacterial function according to another embodiment of the present invention is a first layer in contact with the exterior of the device to be protected; a second layer overlaid on the top surface of the first layer; and a third layer overlaid on the upper surface of the second layer to form an uppermost surface; but, the first layer is polypropylene (PP), polycarbonate (PC), thermoplastic polyurethane (Thermoplastic) Poly Urethane, TPU) and at least one of silicon (Silicon, Si), and the second layer is a first functional material, graphite, graphene, carbon nanotube (Carbon NanoTube, CNT) ), and the third layer is characterized in that it includes at least one of silver, copper, manganese, zinc, and platinum as the second functional material.

On the lower surface of the first layer, a heat insulating material for preventing conduction of heat generated by the device to be protected is applied in a predetermined pattern, and the heat insulating material preferably includes at least silica airgel.

On the other hand, according to an embodiment of the present invention, there is provided a method for manufacturing a plastic case using waste plastics, comprising: pulverizing the collected waste plastics; a mixing step of melting and mixing the pulverized waste plastic with a material including at least one of a synthetic resin, a first functional material, and a second functional material; And, a molding step of extruding the mixture obtained as a result of performing the mixing step, put into a prepared molding mold; Including, the synthetic resin, polypropylene (Polypropylene, PP), polycarbonate (Polycarbonate, PC), thermoplastic poly At least one of urethane (Thermoplastic Poly Urethane, TPU) and silicon (Silicon, Si), and the functional material is at least one of graphite, graphene, and carbon nanotubes (CNT) It is characterized in that it comprises a first functional material including any one, and a second functional material including at least one of silver, copper, manganese, zinc, and platinum.

After performing the above-mentioned pulverization step, a sampling step of performing a sample collection for the pulverized waste plastic; A sample preparation step for a tester of melting the collected sample and applying it to a prepared temporary mold, applying a thickness corresponding to the thickness of a plastic case to be manufactured, and curing the sample to prepare a sample for the tester; A component ratio prediction step of predicting the component ratio of the constituent materials included in the tester sample from the derived test result by performing the electromagnetic wave shielding rate test and the sterilization rate test on the prepared tester sample; And, based on the result of the component ratio prediction step, adding to calculate the addition content of the material including at least one of the synthetic resin melt-mixed with the pulverized waste plastic in the mixing step, the first functional material, and the second functional material content calculation step; is preferably performed.

According to an embodiment of the present invention, a material providing electromagnetic wave shielding and antibacterial functionality is included in the case of the device in which a large amount of electromagnetic waves and bacteria are detected, so that the shielding performance of electromagnetic waves emitted from the portable electronic device is excellent, and bacteria It has the effect of providing a plastic case to prevent occurrence and proliferation.

In addition, according to an embodiment of the present invention, in the present invention, when manufacturing a plastic case, waste plastic is recycled to reduce carbon emissions and to promote resource circulation, thereby reducing costs consumed in the plastic manufacturing process. There is an effect that can be achieved.

In addition, according to an embodiment of the present invention, when the plastic case is manufactured, the electromagnetic wave shielding rate and antibacterial function inspection is preceded, so that the problem of defective products after extrusion molding of the plastic case can be greatly reduced. has the effect of being

1 is an example of the composition ratio of a plastic case including electromagnetic wave shielding and antibacterial functions according to an embodiment of the present invention.
2 and 3 are examples of a structural view of a plastic case including electromagnetic wave shielding and antibacterial functions according to an embodiment of the present invention.
4 and 5 are examples of flowcharts for a method of manufacturing a plastic case using waste plastic according to an embodiment of the present invention.
6 is an example of a process block diagram of a method for manufacturing a plastic case using waste plastic according to an embodiment of the present invention.

Hereinafter, various embodiments and/or aspects are disclosed with reference to the drawings. In the following description, for purposes of explanation, numerous specific details are set forth to provide a thorough understanding of one or more aspects. However, it will also be recognized by one of ordinary skill in the art that such aspect(s) may be practiced without these specific details. The following description and accompanying drawings set forth in detail certain illustrative aspects of one or more aspects. These aspects are illustrative, however, and some of the various methods in principles of various aspects may be employed, and the descriptions set forth are intended to include all such aspects and their equivalents.

As used herein, “embodiment”, “example”, “aspect”, “exemplary”, etc. may not be construed as an advantage or advantage in any aspect or design described above over other aspects or designs. .

Also, the terms "comprises" and/or "comprising" mean that the feature and/or element is present, but excludes the presence or addition of one or more other features, elements and/or groups thereof. should be understood as not

Also, terms including an ordinal number such as 1st, 2nd, etc. may be used to describe various components, but the components are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component. and/or includes a combination of a plurality of related listed items or any of a plurality of related listed items.

In addition, in the embodiments of the present invention, unless otherwise defined, all terms used herein, including technical or scientific terms, are those commonly understood by those of ordinary skill in the art to which the present invention belongs. have the same meaning. Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in an embodiment of the present invention, an ideal or excessively formal meaning is not interpreted as

The present invention relates to a plastic case having electromagnetic wave shielding and antibacterial functions and a method for manufacturing a plastic case using waste plastic, and more specifically, the present invention relates to a case for a device in which a large amount of electromagnetic waves and bacteria are detected, the case The first object is to provide a plastic case to which an electromagnetic wave shielding function and an antibacterial function are imparted by extrusion-molding including a manufacturing raw material, an electromagnetic wave shielding material and an antibacterial material, in manufacturing a plastic case including an electromagnetic wave shielding and antibacterial function A second object is to provide a method for manufacturing a plastic case that promotes resource circulation by allowing waste plastic to be utilized and reduces manufacturing cost.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings, and a plurality of drawings may be simultaneously referenced to describe one or more technical features or components constituting the invention.

As an embodiment, the plastic case including electromagnetic wave shielding and antibacterial functions disclosed in the present invention may preferably include a synthetic resin and a functional material.

At this time, the above-mentioned synthetic resin may include at least one of polypropylene (PP), polycarbonate (PC), thermoplastic polyurethane (Thermoplastic Poly Urethane, TPU), and silicone (Si).

Specifically, the above-mentioned polypropylene is a polymer of propylene, has the lightest density among plastics (0.90 to 0.91), has high mechanical strength, has excellent heat resistance, and is relatively transparent. It has characteristics such as impact resistance, heat resistance, weather resistance, self-extinguishing properties and transparency, and has an impact degree of about 150 times that of tempered glass, so it has excellent flexibility and processability.

The above-described thermoplastic polyurethane exhibits intermediate properties between polyamide and polyester, has excellent mechanical properties with high elasticity, and has excellent aging resistance and weather resistance. In particular, thermoplastic polyurethane has the advantage that it can be used in an environment-friendly manner because no additional chemicals are added.

In addition, the above-described silicone does not easily slip from the user's hand, helping to improve the grip feeling of the case, and has an effect of providing convenience of detachment between the portable electronic device and the case due to good elasticity.

On the other hand, the synthetic resin referred to in the present invention may be used independently of any one of the above-described materials, but preferably by using a mixture of two or more materials to compensate for the lack of physical properties.

In addition, as described above, the plastic case including the electromagnetic wave shielding and antibacterial function of the present invention includes a functional material in addition to the above-described synthetic resin.

The functional material referred to in the present invention preferably includes a first functional material providing a function of shielding electromagnetic waves, and a second functional material providing a function of sterilizing or blocking and inhibiting the propagation of bacteria. desirable.

At this time, the above-described first functional material may include at least one of graphite, graphene, and carbon nanotube (CNT). As a carbon allotrope with excellent conductivity, it can be understood as materials added to provide an electromagnetic wave shielding function.

That is, in the present invention, in order to allow the non-conductive plastic case to shield electromagnetic waves emitted from portable electronic devices, etc., a carbon allotrope, which is a conductive material, is applied to a synthetic resin that is the main raw material of the plastic case, and the carbon allotrope to the portable electronic device. It is possible to provide an electromagnetic wave shielding function by reflecting or absorbing electromagnetic waves generated from

Meanwhile, in the above description, the first functional material exhibiting electromagnetic wave shielding performance has been described by limiting the carbon allotrope, but other conductive materials including the carbon allotrope mentioned above may be substituted and used, and the present invention is not limited thereto. .

In addition, the above-described second functional material may include at least one of silver, copper, manganese, zinc, and platinum.

At this time, the above-described second functional material may be understood as a material exhibiting antibacterial properties such as sterilizing bacteria or inhibiting the reproduction of bacteria, and preferably, the second functional material has a size of nanoparticles (100 nm or less). It would be preferable to use it after processing it into colloidal particles using a liquid such as water as a dispersion medium. This is because the smaller the particle size, the greater the number of atoms on the surface that can come into contact with bacteria and the amount of emitted ions increases. It may be understood that this is because it can improve antibacterial performance.

On the other hand, the plastic case including the electromagnetic wave shielding and antibacterial function made of the aforementioned synthetic resin, the first functional material, and the second functional material can be manufactured by mixing these components or by overlaying each material with a multi-layer. .

First, referring to FIG. 1 as a description of a plastic case including an electromagnetic wave shielding and antibacterial function by mixing a synthetic resin, a first functional material, and a second functional material with each other, FIG. 1 shows the component ratio for mixing these components It can be seen that an example is shown.

Specifically, in FIG. 1 a, the component ratio of the synthetic resin, the first functional material, and the second functional material is shown based on 100% by weight of the total, and in the present invention, based on 100% by weight of the total, the synthesis The resin may include 75 to 90% by weight, 3 to 15% by weight of the first functional material, and 2 to 10% by weight of the second functional material.

At this time, it will be understood that the added content of the above-described synthetic resin is the minimum content required for a case to protect a mobile electronic device, etc., and when less than 75 wt% of the total 100 wt% is added, the original case Since there is concern about a decrease in function, it would be preferable to use an added content in the above-described range.

As an embodiment, in the present invention, based on 100% by weight of the total, 90% by weight of the synthetic resin, 6% by weight of the first functional material, and 4% by weight of the second functional material may be included.

A more detailed embodiment of this is shown in FIG. 1 b, in the present invention, based on 100% by weight of the total, polypropylene 5% by weight, polycarbonate 10% by weight, thermoplastic polyurethane 70% by weight, silicone 5% by weight , graphite 3% by weight, graphene 2% by weight, carbon nanotubes 1% by weight, silver 0.5% by weight, copper 1% by weight, manganese 1% by weight, zinc 1% by weight, platinum 0.5% by weight, The above-described component ratio in FIG. 1 b is an optimal component ratio of a plastic case including electromagnetic wave shielding and antibacterial functions, and the deterioration of the physical properties of the plastic case itself (for example, touch, grip, elasticity, impact resistance, heat resistance, etc.) is minimal, and electromagnetic wave It may be understood as a ratio of components that provide blocking and absorption performance and antibacterial performance.

Next, referring to FIG. 2 as another embodiment of the present invention, in the present invention, a plastic case (10) including an electromagnetic wave shielding and antibacterial function by overlaying a synthetic resin, a first functional material, and a second functional material in multi-layers ) can be provided.

In more detail, in the present invention, the first layer 11 that comes in contact with the exterior of the device to be protected, the second layer 12 overlaid on the upper surface of the first layer 11, and the upper surface of the second layer 12 and a third layer 13 overlaid on to form a top surface.

In this case, the above-described first layer 11 may be understood as a layer including at least one of polypropylene, polycarbonate, thermoplastic polyurethane, and silicone, or a mixture of two or more materials.

Specifically, when two or more materials are mixed and used, the first layer 11 contains 2 parts by weight of polycarbonate, 14 parts by weight of thermoplastic polyurethane, and 1 part by weight of silicone, based on 1 part by weight of polypropylene. It is preferable to include it in parts by weight, and it can be understood that the material mixing ratio of the first layer 11 is a mixing ratio that allows the device and the case 10 to be in close contact with each other and imparts heat resistance and impact resistance. will be.

Next, the second layer 12 overlaid on the upper surface of the first layer 11 described above, as a first functional material for electromagnetic wave shielding, includes at least one of graphite, graphene, and carbon nanotubes, or , can be understood as a layer in which two or more materials are mixed.

At this time, for the second layer 12 described above, the first functional material is processed into particles having a size of 100 nm or less, and then a material in the form of being dispersed in a colloidal phase using water or other dispersion medium is used. Preferably, the second layer 12 is overlaid on the first layer 11 by mixing 2 parts by weight of graphene and 3 parts by weight of graphite with respect to 1 part by weight of carbon nanotubes.

That is, in the present invention, the above-described first functional material is overlaid on the first layer 11, and functions to reflect and absorb electromagnetic waves emitted from portable electronic devices, etc., thereby providing a plastic case 10 having an electromagnetic wave shielding effect. be able to

Next, the third layer 13, which is overlaid on the upper surface of the above-described second layer 12 to form the uppermost surface, contains at least one of silver, copper, manganese, zinc and platinum, which are antibacterial substances against bacteria. It may be understood as a layer containing or mixing two or more materials.

Specifically, the third layer 13 described above includes 2 parts by weight of copper, 2 parts by weight of manganese, 2 parts by weight of zinc, and 1 part by weight of platinum based on 1 part by weight of silver, and it is cured by dispersing them in a colloidal state. It is preferable to form the third layer 13 by doing so.

On the other hand, the above-mentioned silver, copper, manganese, zinc and platinum correspond to inorganic antibacterial substances, are antibacterial substances that do not contain substances harmful to the human body and the environment, remove bacterial cell membranes, inhibit the energy metabolism of bacteria, Since the generation and growth of bacteria can be suppressed by changing the internal structure of the bacteria, it can be suitably used for the plastic case 10 used in portable electronic devices, etc., which are frequently in contact with the body.

In addition, before the above-described first to third layers 13 are completely cured, a compression process may be further performed by applying a predetermined pressure to mutually compress them, but the present invention is not limited thereto.

On the other hand, referring to FIG. 3 as another embodiment of the present invention, in the present invention, the lower surface of the first layer 11 (that is, the surface opposite to the surface on which the second layer 12 is formed) is carried. The surface in contact with the electronic device) is preferably coated with the insulating material 110 for preventing the conduction of heat generated by the device to be protected in a preset pattern.

Preferably, the above-described insulating material 110, silica airgel (Silica Aerogel) may be used, the above-mentioned silica airgel is in the form of an airgel of silicon dioxide, 98% of the total volume is made of nano-sized bubbles, very lightweight and , provides good impact resistance and thermal insulation properties.

Accordingly, in the present invention, the above-described silica airgel is applied to the lower surface of the first layer 11 to increase the impact strength of the plastic case covered on the portable electronic device without a large increase in weight, and further, refer to FIG. 3 After applying the silica airgel in the same or similar pattern as identified in a and b of By minimizing the transfer, it is possible to prevent deformation and discoloration of the plastic case.

At this time, the above-mentioned silica airgel is preferably to form a three-dimensional pattern of a shape protruding from the lower surface of the first layer 11, more preferably, a gap between the patterns is provided, and the gap is formed at the end of the path. It may be desirable to provide a gap in the corresponding plastic case so that heat generated by the portable electronic device moves along the gap and is dissipated to the outside through the gap.

Accordingly, the shape of the mold used to manufacture the plastic case in the present invention may be a mold having a shape that allows to form voids on one side of the plastic case, and in FIG. 3, silica airgel is a bar. Although the description is limited to the embodiment constituting the type pattern, it is natural that various patterns including a zigzag type and a wavy type may be applied, and it is natural that the direction of the pattern may also be changed and modified and applied.

Next, reference will be made to FIG. 4 for a more detailed description of a method of manufacturing a plastic case including the aforementioned electromagnetic wave shielding and antibacterial functions.

As shown in Figure 4, in the present invention, the crushing step (S10) of crushing the collected waste plastic first may be performed. In this case, the term “waste plastic” collected in step S10 described above includes at least one of a plastic case of a portable electronic device discarded after use and a plastic case of a portable electronic device that is determined to be defective during the process in a narrow range. It will be understood as a general concept of plastic waste in a wide range.

It should be understood that such waste plastics are preferably waste plastics after collection, washing and drying, and known techniques may be applied to these washing and drying processes.

In addition, the pulverization of the waste plastic in the above-described step S10 is, for example, to be pulverized to have a size of less than 5 mm using an equipped pulverizer, thereby reducing the time required for melting the material in the mixing step described later. have.

Meanwhile, after performing the above-described step S10, a mixing step (S20) of melt-mixing the pulverized waste plastic with a material including at least one of a synthetic resin, a first functional material, and a second functional material is performed.

At this time, in step S20, the above-mentioned materials are melt-mixed at a preset temperature (for example, 200 to 450 degrees) in a dedicated mixer for performing melt mixing, and a dedicated mixer equipped with a screw is used to increase the efficiency of melt mixing. will be able

After performing the above-described step S20, a molding step (S30) of extruding the mixture obtained as a result of performing the step S20 into a molding mold may be performed.

In this case, it is preferable to use an extruder in step S30 described above, and it is natural that the injection molding method using an injection machine may be changed and applied in addition to the extrusion method.

On the other hand, referring to FIG. 5 as another embodiment of the present invention, in the present invention, in the description of steps S10 to S30, a separate process may be further performed after performing step S10 and before performing step S20. .

Specifically, in the present invention, after performing step S10, a sampling step (S11) of performing sample collection on the pulverized waste plastic using a sampler may be performed. Preferably, when performing the above-described step S11, one It would be desirable to collect two or more samples rather than taking a sample, so as to minimize errors due to sampling.

In addition, after performing the above-described step S11, the collected sample is melted and extruded into a prepared temporary mold, extruded to a thickness corresponding to the thickness of the plastic case to be manufactured, and then cured to prepare a tester sample A manufacturing step (S12) may be performed.

At this time, it will be understood that the extruding to a thickness corresponding to the thickness of the plastic case in step S12 described above is to process the plastic case to be actually manufactured and the tester sample under similar conditions.

On the other hand, after performing step S12, the component ratio prediction step of predicting the component ratio of the constituent materials included in the tester sample from the test result derived by performing the electromagnetic wave shielding rate test and the sterilization rate test on the prepared tester sample (S13) will be performed

In this case, in the above-described electromagnetic shielding rate test, a tester sample is placed between the electromagnetic signal generator and the electromagnetic signal receiver, and then a specific electromagnetic signal is radiated to the tester sample through the electromagnetic signal generator, and from the received value of the electromagnetic signal receiver. It may be understood as deriving a test result for the electromagnetic wave shielding performance of the tester sample.

In addition, in the above-described sterilization rate test, the test strain is diluted to a certain concentration in the suspension, sprayed on the tester sample, and the growth or reduction rate of bacteria after a certain time is compared, thereby deriving the test result for the antibacterial performance of the tester sample. It can be understood as something that can be done.

Meanwhile, in the present invention, it is possible to detect a deficient component required for manufacturing a plastic case using waste plastic from the results of the electromagnetic wave shielding rate test and the sterilization rate test.

For example, as a result of the electromagnetic wave shielding rate test, when the electromagnetic wave shielding rate does not meet the preset threshold, the first functional material (of graphite, graphene, and carbon nanotubes) that exhibits electromagnetic wave shielding performance on the collected waste plastics If it is determined that the component ratio of at least one) is not sufficient, it may require the addition of the first functional material, and as a result of the sterilization rate test, the sterilization rate for bacteria does not satisfy the preset threshold value It is judged that the composition ratio of the second functional material (at least any one of silver, copper, manganese, zinc and platinum) that exerts sterilization or antibacterial performance on the old waste plastic is not sufficient, so that the addition of the second functional material may be requested. .

That is, in the present invention, by performing the above-described step S13, it is possible to provide a plastic case that promotes efficient reuse of waste plastics in a relatively simple way, and further provides electromagnetic wave shielding and antibacterial functions in addition to recycling waste plastics. It works.

Meanwhile, after performing the above-described step S13, a material comprising at least one of a synthetic resin, a first functional material, and a second functional material that is melt-mixed with the waste plastic pulverized in the mixing step based on the component ratio prediction result of the step S13 The addition content calculation step (S14) to calculate the addition content of is performed.

Specifically, the addition content calculation step calculates the addition amount of the first functional material required to increase the electromagnetic wave shielding rate per day on a weight basis based on the test results obtained in the previous electromagnetic wave shielding rate test and sterilization rate test, It may be understood that the addition amount of the second functional material required to increase the unit sterilization rate is calculated on the basis of weight.

At this time, in the processor of the present invention to calculate the addition content as described above, the addition amount of the first functional material to increase the electromagnetic wave shielding rate per unit and the addition amount of the second functional material to increase the sterilization rate per unit are determined in a number of experiments. It should be understood as being DB based on data.

Meanwhile, FIG. 6 schematically shows a process block diagram of a method for manufacturing a plastic case using waste plastic including steps S11 to S14 described above.

Referring to FIG. 6 , in the present invention, the collected waste plastic is pulverized using a pulverizer, a sample of the pulverized waste plastic is collected by a sample collector, and a sample for a tester is prepared by extrusion or injection.

Thereafter, by emitting electromagnetic waves to a sample for a tester manufactured with an electromagnetic signal generator, the electromagnetic wave blocking ability of the sample for the tester is tested from the received value of the electromagnetic signal receiver, and the suspension in which the test strain is diluted is sprayed on the sample for the tester Thus, the antibacterial ability is tested by looking at the amount of growth or reduction of bacteria after a preset time.

On the other hand, when the above-described functional test is completed, the processor of the present invention predicts the composition ratio of the waste plastic collected from the test result of the functional test, and calculates the additional amount of material added to impart functionality to the manufactured plastic case.

Accordingly, in the mixer, materials exhibiting sufficient electromagnetic wave shielding functionality and antibacterial functionality in manufacturing a plastic case by reusing waste plastic are made, and through this, extrusion molding in an extruder or injection molding in an injection molding machine is completed. It is possible to prevent a decrease in the yield of a good product due to a decrease in the functionality of the plastic case.

Overall, according to an embodiment of the present invention, a material providing electromagnetic wave shielding and antibacterial functionality is included in the case of the device in which a large amount of electromagnetic waves and bacteria are detected, so that the shielding performance of electromagnetic waves emitted from portable electronic devices is excellent and , has the effect of providing a plastic case to prevent the generation and proliferation of bacteria.

In addition, according to an embodiment of the present invention, in the present invention, when manufacturing a plastic case, waste plastic is recycled to reduce carbon emissions and to promote resource circulation, thereby reducing costs consumed in the plastic manufacturing process. There is an effect that can be achieved.

In addition, according to an embodiment of the present invention, when the plastic case is manufactured, the electromagnetic wave shielding rate and antibacterial function inspection is preceded, so that the problem of defective products after extrusion molding of the plastic case can be greatly reduced. has the effect of being

Meanwhile, in the above description, from the embodiments of FIGS. 1 to 6, the plastic case including the electromagnetic wave shielding and antibacterial function of the present invention and the manufacturing method of the plastic case using the waste plastic have been described, but the spirit of the present invention is not It is not limited to the embodiments presented in the specification, and those skilled in the art who understand the spirit of the present invention will be able to easily suggest other embodiments by adding, changing, deleting, or adding components within the scope of the same idea. , which will also fall within the scope of the present invention.

In addition, terms such as "comprises", "comprises" or "have" described above mean that the corresponding component may be embedded, unless otherwise stated, excluding other components. Rather, it should be construed as being able to include other components further. All terms, including 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, unless otherwise defined. Terms commonly used, such as those defined in the dictionary, should be interpreted as being consistent with the meaning in the context of the related art, and are not interpreted in an ideal or excessively formal meaning unless explicitly defined in the present invention.

The above description is merely illustrative of the technical spirit of the present invention, and various modifications and variations will be possible without departing from the essential characteristics of the present invention by those skilled in the art to which the present invention pertains. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

Claims (6)

In the plastic case including electromagnetic wave shielding and antibacterial function,
including synthetic resins and functional materials,
The synthetic resin includes at least one of polypropylene (PP), polycarbonate (PC), thermoplastic polyurethane (Thermoplastic Poly Urethane, TPU), and silicone (Silicon, Si),
The functional material includes a first functional material including at least one of graphite, graphene, and carbon nanotube (CNT), and at least any one of silver, copper, manganese, zinc and platinum. A plastic case with an electromagnetic wave shielding and antibacterial function, characterized in that it contains a second functional material that includes one.
According to claim 1,
The component ratio of the synthetic resin, the first functional material and the second functional material is based on 100% by weight of the total, 75 to 90% by weight of the synthetic resin, 3 to 15% by weight of the first functional material, and the A plastic case with an electromagnetic wave shielding and antibacterial function, characterized in that it contains a second functional material in an amount of 2 to 10% by weight.
In the plastic case including electromagnetic wave shielding and antibacterial function,
a first layer in contact with the exterior of the device to be protected;
a second layer overlaid on an upper surface of the first layer; and,
a third layer overlaid on the upper surface of the second layer to form an uppermost surface;
The first layer comprises at least one of polypropylene (PP), polycarbonate (PC), thermoplastic polyurethane (Thermoplastic Poly Urethane, TPU), and silicone (Silicon, Si),
The second layer includes at least one of graphite, graphene, and carbon nanotube (CNT) as a first functional material,
The third layer is a second functional material, and the plastic case with electromagnetic wave shielding and antibacterial functions, characterized in that it contains at least one of silver, copper, manganese, zinc and platinum.
4. The method of claim 3,
On the lower surface of the first layer,
Insulation material for preventing the conduction of heat generated in the device to be protected is applied in a preset pattern,
The insulating material is a plastic case with electromagnetic wave shielding and antibacterial function, characterized in that it contains at least silica airgel (Silica Aerogel).
In the manufacturing method of a plastic case using waste plastic,
a pulverizing step of pulverizing the collected waste plastics;
a mixing step of melting and mixing the pulverized waste plastic with a material including at least one of a synthetic resin, a first functional material, and a second functional material; and,
A molding step of extruding the mixture obtained as a result of performing the mixing step into a prepared molding mold;
The synthetic resin includes at least one of polypropylene (PP), polycarbonate (PC), thermoplastic polyurethane (Thermoplastic Poly Urethane, TPU), and silicone (Silicon, Si),
The functional material includes a first functional material including at least one of graphite, graphene, and carbon nanotube (CNT), and at least any one of silver, copper, manganese, zinc and platinum. A method of manufacturing a plastic case using waste plastic, characterized in that it includes a second functional material that contains one.
6. The method of claim 5,
After performing the grinding step,
a sampling step of performing sampling on the pulverized waste plastic;
A sample preparation step for a tester in which the collected sample is melted and extruded into a prepared temporary mold, extruded to a thickness corresponding to the thickness of the plastic case to be manufactured, and then cured to prepare a sample for the tester;
A component ratio prediction step of predicting a component ratio of the constituent materials included in the tester sample from the derived test result by performing an electromagnetic wave shielding rate test and a sterilization rate test on the prepared tester sample; and,
Addition content of a material including at least one of the synthetic resin, the first functional material, and the second functional material that is melt-mixed with the pulverized waste plastic in the mixing step based on the result of the component ratio prediction step A method of manufacturing a plastic case using waste plastic, characterized in that performed;

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