KR20100052778A - Painting system and method for magneticallly formed pattern - Google Patents

Abstract

PURPOSE: A painting system and a method for a magnetic pattern are provided to obtain a film with an excellent distinctness, to reduce a producing time of the film, and to obtain various patterns with a simple process. CONSTITUTION: A painting system for a magnetic pattern comprises the following: dies(11,12) capable of opening and closing for inserting a semi-product(20) and drawing a painted product out; a magnetic field generator(30) forming a magnetic field for aligning a magnetic pigment while being installed in the dies; and a nozzle(7) for inserting a polyurethane composition including the magnetic pigment into a filling space inside the dies. The polyurethane composition including the magnetic pigment is sprayed to the surface of the semi-product to form a coating layer for forming a three-dimensional pattern using the magnetic field generator.

Description

[Painting system and method for magneticallly formed pattern}

The present invention relates to a self-painting apparatus and method, and more particularly, a polyurethane composition comprising a magnetic pigment is reacted and injected onto the surface of a semi-finished product in a mold to form a coating layer having a high sensational thick film and reacting the magnetic pigment to an external magnetic field. The present invention relates to a self-painting apparatus and a method for implementing a specific pattern.

As is well known, a lot of efforts have been made to implement various patterns and colors on the surface layer while maintaining excellent physical properties in order to improve the degree of freedom of design in products having complex three-dimensional shapes and various sizes.

In particular, various methods have been applied to maximize the aesthetic effect in automobile interior materials, home appliances, etc. In particular, in recent years, in order to satisfy consumer needs, methods such as painting, plating, hydraulic transfer, and insert molding are used. Various shapes, colors, and patterns are given.

Conventional painting process is possible to implement a variety of colors, but it is difficult to implement a specific pattern, even if the implementation of masking process is required. In particular, there is a difficulty in mass production by manual work due to the difficulty of implementing a variety of patterns.

In addition, in the case of hydraulic transfer, various patterns and colors can be realized, but the process is complicated and production costs are high.In the case of insert molding, the process is simple, but the film for insert molding is expensive and preforming. There is a hassle to go through the process.

In addition, the above-described conventional processes had a disadvantage in that the clear layer or the top layer was thin and the quality was poor.

Accordingly, after the injection molding of the product to form a variety of patterns on the surface of the product (Ferrite) is performed, a self-painting method for forming a pattern pattern using a stator magnet or an electromagnet has been proposed [Japanese Patent No. 2868948 / US Patent No. 5364689].

In the self-painting method, the product (object) is injected, painted (Ferrite), pattern pattern formation, drying process, and after the painting process, a separate pattern process must be performed with a fixed magnet or an electromagnet. Electromagnetic wave generation). The electromagnetic field generating mechanism may be installed before the painting process in some cases, the coating process may be made after the electromagnetic field generating mechanism is installed in this way.

However, in the case of the self-painting method, there is considerable difficulty in manufacturing a mechanism and a device having a constant distance between a magnet and a magnetic pigment which generate a magnetic field when targeting an embedded component having a complicated shape. In other words, it is very difficult to manufacture a mechanism and a device having a uniform magnetic field strength.

Therefore, the present invention has been invented to solve the problems of the conventional self-painting method as described above, it becomes possible to form a three-dimensional pattern with a simple configuration provided with a magnetic field generating mechanism capable of forming a magnetic field of a desired pattern in the mold It is an object of the present invention to provide a magnetic coating apparatus and a magnetic coating method using the same.

In addition, the present invention is a low-temperature low-pressure injection of a polyol containing a magnetic pigment and a hardener isocyanate on the surface of the semi-finished product using a polyurethane reaction injection and impart a magnetic force having a specific shape pattern at the same time, the magnetic pigments in the paint It is an object of the present invention to provide a self-painting apparatus and method capable of forming various patterns by forming a specific three-dimensional pattern by means of forming a good three-dimensional pattern.

In order to achieve the above object, the present invention includes a mold capable of opening and closing so that a semi-finished product is put in and a finished product can be taken out; A magnetic field generating mechanism installed in the mold on the surface of the semifinished product surface in the mold and forming a magnetic field for the arrangement of the magnetic pigments; An injection mechanism including a nozzle for injecting a polyurethane composition containing a magnetic pigment into a filling space in the mold toward the semi-finished paint surface; wherein the polyurethane composition comprising the magnetic pigment is formed by the nozzle. When the coating layer is formed by injection into the surface of the semi-finished product, the magnetic field generating mechanism forms a magnetic field, and the three-dimensional pattern is configured to form a three-dimensional pattern simultaneously with the urethane reaction while the magnetic pigments in the coating layer are arranged according to the shape of the magnetic field. Provided is a self-painting apparatus for forming.

In a preferred embodiment, the magnetic field generating mechanism is characterized by consisting of an electromagnet disposed in consideration of a desired magnetic field shape and a pattern shape in a mold on the surface of the semi-finished product, and a control unit for controlling a power applied to the electromagnet.

In addition, the electromagnet is characterized in that the coil is superimposed on the iron core and inserted into the magnet mounting space provided in the mold.

In addition, the control unit is characterized in that it is provided to apply a pulse current of 1000 ~ 2000 ㎌, 500 ~ 1000 V to the electromagnet for 1 to 3 seconds.

And, the present invention comprises the steps of mounting a semi-finished product in a mold; Injecting a polyurethane composition comprising a magnetic pigment into the filling space in the mold toward the semi-finished paint surface by using a nozzle; Forming a magnetic field by applying electric power to an electromagnet installed in a mold on the surface of the semi-finished product and forming a three-dimensional pattern by arranging the magnetic pigments according to the shape of the magnetic field simultaneously with the urethane reaction of the polyurethane composition; It provides a self-coating method for forming a three-dimensional pattern comprising a; taking out the product in a state in which the three-dimensional pattern by the magnetic pigment is fixed after curing of the polyurethane resin.

In a preferred embodiment, the magnetic pigment is characterized in that the ferrite (magnetic) magnetic pigment.

In addition, in the process of applying power to the electromagnet is characterized in that the magnetic field is formed by applying a pulse current of 1000 ~ 2000 2000, 500 ~ 1000 V to the electromagnet for 1 to 3 seconds.

Accordingly, according to the magnetic coating apparatus and method of the present invention, there is an effect that the three-dimensional pattern can be formed by a simple configuration in which a magnetic field generating mechanism capable of forming a magnetic field having a desired pattern in the mold is provided. In particular, according to the magnetic field generating mechanism of the present invention provided in the mold, the distance between the magnet (the coil wound electromagnet) and the magnetic pigment that generates the magnetic field for a built-in component having a complicated shape is kept constant (magnetic field). Uniformity of intensity) is possible. In addition, according to the magnetic field generating mechanism of the present invention installed in the mold, it is possible to form a coating film having a high sensibility of depth using polyurethane reaction injection, while forming a magnetic field at the same time as the injection to implement a pattern to shorten the production time There is an advantage. In addition, by having a magnetic field generating mechanism that enables the implementation of a variety of patterns in the mold has the advantage that the pattern formation is easy. Applying the above-described magnetic coating apparatus and method of the present invention, it is possible to implement a specific pattern of three-dimensional solid shape by arranging the magnetic pigment contained in the paint in accordance with the magnetic field on the coating layer having a high sensibility of depth, automobile interior and exterior There is an advantage that can improve the merchandise, such as parts, home appliances, or decorative products. In addition, when the pattern is implemented, it is possible to implement a sense of depth and a specific pattern in the product within a process, thereby simplifying the process and maximizing the aesthetic effect.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

The present invention relates to a three-dimensional pattern implementation technology using a polyurethane reaction injection, the polyurethane reaction injection and the magnetic arrangement of the magnetic pigment on the surface of the product (e.g., plastic products such as ABS, ABS / PC) The present invention relates to a coating apparatus and method capable of forming a three-dimensional solid pattern in a surface coating layer (coating film).

In the present invention, the polyurethane composition containing the magnetic pigment is reacted and injected on the surface of the semi-finished product in the mold (hereinafter, the surface to be coated) to form a coating layer having a high sensational thick film, and the magnetic pigment is reacted with an external magnetic field to produce a specific pattern. Will be implemented.

In particular, in order to form a highly striated coating film having various pattern patterns, a polyurethane composition for self-coating (surface coating), that is, a polyurethane composition comprising a polyol resin and an isocyanate which is a hardener and containing as a magnetic pigment is contained in a mold equipped with semi-finished products. By injecting and applying an external magnetic field having a specific pattern, the three-dimensional three-dimensional pattern is realized by arranging the ferromagnetic material in the polyurethane resin according to the magnetic field pattern and curing the same during the urethane reaction.

1 is a process diagram illustrating a self-painting process according to the present invention, FIG. 2 is a schematic view showing a state in which raw material supply and polyurethane reaction injection are made in the self-painting apparatus according to the present invention, and FIG. 3 is according to the present invention. It is a schematic diagram which shows the state in which a magnetic pigment is arrange | positioned at the time of providing a magnetic field in a magnetic coating apparatus.

As shown in Fig. 1, in the present invention, a semi-finished product (coated object) is inserted into a mold, and is separately mixed with an isocyanate which is a curing agent by separately mixing polyol and magnetic pigment.

Then, a mixture of a polyol containing a magnetic pigment and a curing agent is injected into the painted surface of the semi-finished product mounted in the mold and injected, and at the same time, a magnetic field is formed to form a three-dimensional solid pattern by arranging the magnetic pigments according to the shape of the magnetic field.

When the mixture is injected and a magnetic field is formed, a urethane reaction occurs, and the magnetic pigments in the mixture are arranged in the shape of a magnetic field to form a three-dimensional three-dimensional pattern pattern. After the polyurethane is cured, the pattern pattern is fixed.

Referring to FIG. 2, one embodiment of the raw material supply will be described in detail. First, the polyol and the magnetic pigment are mixed at 40 to 60 ° C. in the storage tank 1 as a first raw material state, and an isocyanate as a curing agent is also stored in the storage tank ( 2) It is maintained at the same temperature within.

The polyol, magnetic pigment, and isocyanate stored as described above are transferred to the heating bath 5 by the pumps 3 and 4, respectively, and maintained at 60 to 70 ° C., and then transferred to the mixer 6 to supply the mold. Final mixing is performed, in which case the mixture is mixed at approximately 80 ° C. for 10 to 20 minutes at a predetermined weight ratio.

At this time, it is important to secure the coating film properties by optimizing the content of the magnetic pigment and the resin blending ratio, and as an example, polyol, isocyanate, and magnetic pigment in a weight ratio of 'polyol: isocyanate: magnetic pigment = 100: 180: 30 ~ 100: 260: It can be mixed and used in the ratio of 100 '.

Ferrite-based magnetic pigments may be used as the magnetic pigment used in the present invention, and the ferrite-based magnetic pigments may be in the form of flakes having a good reactivity to magnetic fields so that a specific pattern may be expressed in response to an external magnetic field. Ferrite-based magnetic particles having ferromagnetic properties.

At this time, the flakes used can be a metal or non-metallic component having magnetic properties, ferromagnetic materials of ferrite, nickel, cobalt, and antiferromagnetic materials such as manganese oxide and chromium oxide, and ferromagnetic materials coated on mica. Materials can also be used.

In addition, the ferrite pigment may use magnetic particles coated with silicon, preferably ferrite magnetic particles coated with silicon, and have excellent light resistance and heat resistance as compared to pigments containing uncoated ferrite magnetic particles. .

As described above, the ferrite-based magnetic pigment includes flake-type ferrite-based magnetic particles, and the magnetic particles may have a size of 10 to 30 μm and a thickness of 1 to 5 μm. If the size of the magnetic particles is less than 10 μm, even though the size of the pigments is small, the area reflecting light may be small and the pattern may not be easily seen. Formation can be difficult. In addition, when the thickness is less than 1 ㎛ may cause a problem that the particles are broken during dispersion, and when it is more than 5 ㎛ is seen as a spherical rather than a three-dimensional pattern is not preferable because only the effect of the metallic may occur. The magnetic pigment basically contains a metal component in order to be ferromagnetic, so that the movement of free electrons occurs when heat or light is applied from the outside to discolor the resin.

As described above, the mixed polyurethane composition is injected into the mold 12 on which the semi-finished product 20 is mounted to form a surface coating layer, and when the magnetic field is formed by the magnetic field generating mechanism 30 installed in the mold 12, the magnetic pigment. Is arranged according to the magnetic field shape to form a three-dimensional solid pattern.

Referring to the self-painting apparatus according to the present invention in more detail, as shown in Figures 2 and 3, the mold (11, 12) is opened and closed so that the semi-finished product 20 is put and the finished product is taken out, and the The magnetic field generating mechanism 30 including the electromagnet 31 installed in the mold 12 on the semi-finished paint surface (skin surface) side of the molds 11 and 12, and the filling in the mold 12 on the semi-finished paint surface side ( Iii) The injection mechanism including the nozzle 7 for injecting the polyurethane composition containing the magnetic pigment into the space has a main configuration.

Here, when the mold is composed of the first mold 11, the fixed mold and the second mold 12, the movable mold for opening and closing, the product of the first mold 11 in the open state of the second mold 12 After mounting the semi-finished product 20 in the space, the second mold is closed, and the raw material is injected and reacted using the nozzle 7 into the filling space provided between the second mold and the semi-finished paint surface.

At this time, the magnetic field should be given at the same time as the reaction, and the second mold 12, which is the mold on the surface of the semi-finished product, is provided with an electromagnet 31 of the magnetic field generating mechanism 30 to enable the magnetic field to be formed.

In the present invention, the electromagnet 31 is configured by winding a coil around an iron core like a conventional electromagnet, and provides a magnet mounting space into which the electromagnet 31 can be inserted into the mold 12, and an electromagnet having a coil wound around the core. Insert it into the magnet mounting space and install it. In this case, when the power is applied, the electromagnet 31 is properly disposed in the mold 12 so that a magnetic field having a desired pattern shape may be formed on the surface of the product.

Since the shape of the magnetic pigment is arranged in the polyurethane resin forming the coating layer, that is, the shape of the pattern is determined according to the shape of the magnetic field formed by the electromagnet, the electromagnet in the mold is inserted in consideration of the desired pattern of the pattern and the magnetic field. Appropriately design the shape of the space to be made, the shape of the iron core and the electromagnet, the winding arrangement of the coil, and the like.

Referring to FIG. 3, it can be seen that an electromagnet 31 having a coil wound on an iron core is inserted into a mold (second mold) 12 on the painted surface (skin surface to be coated) of the semi-finished product 20. The electromagnet 31 is driven by receiving power from a control unit (CCP) 32.

That is, the controller 32 is a component that generates and applies power to drive the electromagnet 31 to form a magnetic field. When the controller 32 applies a current to the coil of the electromagnet 31, a magnetic field is generated and The magnetic pigment is arranged in the urethane resin, and at this time, the magnetic pigment is arranged in accordance with the line of magnetic force to form a pattern.

The control unit may be provided to perform current control in a variable resistor type or an encoder type, and control such as magnetic field strength and time as well as on / off control of an electromagnet through such current control. Is possible.

In a preferred embodiment of the present invention, a polyurethane composition in which a polyol, a hardener, an isocyanate and a magnetic pigment are mixed is injected into a mold 12 equipped with a semi-finished product 20, and then the control unit 32 is 1000 to 2000 kPa, 500 It is possible to apply a pulse current of ˜1000 V to the electromagnet 31 for 1 to 3 seconds to form a magnetic field.

Here, when it is set to less than 1,000 kW, the electric capacity is small, so it is difficult to generate a sufficient magnetic field, and if it exceeds 2,000 kW, the electric capacity is too large, so that it is difficult to arrange the magnetic pigment by the magnetic field.

In addition, when the voltage is applied below 500 V, the magnetic field is so weak that the arrangement of the magnetic pigment is difficult. Therefore, when the voltage is applied above 1,000 V, the magnetic field is strong and the magnetic pigment is concentrated in one place. It is not preferable because there is a problem of aggregation of pigments.

In addition, when the pulse current is applied in less than 1 second with respect to the time, there is a problem that the pattern formation is not good because the time for arranging the magnetic pigment with respect to the external magnetic field is short, and the workability is deteriorated when applied for more than 3 seconds. It is not desirable to have.

On the other hand, the three-dimensional pattern forming process using the polyurethane reaction injection using the self-coating device made as described above are as follows.

First, a polyol, an isocyanate, and a magnetic body are formed by using the nozzle 7 to form a coating layer on the surface of the semi-finished product in a state in which the semi-finished product 20 is mounted on the first mold 11 and the second mold 12 is closed. Inject the polyurethane composition mixed with the pigment, wherein the injection conditions of the embodiment is as follows.

Nozzle temperature: 80 ~ 85 ℃

-Nozzle Diameter: 2.4 ~ 2.8 mm

Injection rate: 15-21 g / s

Injection pressure: 150 ~ 200 bar

After the polyurethane composition is injected through the nozzle 7, the magnetic field is formed while the mold temperature is maintained at 50 to 65 ° C. At the same time as the urethane reaction, a pulse current of 1000 to 2000 mA and 500 to 1000 V is applied. It is applied to the electromagnet 31 for a second to form a magnetic field. At this time, the pattern is formed while the magnetic pigment is arranged in the coating layer according to the shape of the formed magnetic field. 4 is a schematic view of a state in which a pattern is formed in the self-painting apparatus according to the present invention.

After the injection of raw materials, the product is taken out after 120 to 240 seconds. During this time, the urethane reaction and the arrangement of the magnetic pigments are formed at the same time, forming a patterned pattern. After the polyurethane is cured, the magnetic pigments are patterned. It will be completely fixed in the shape of.

Through the above process it is possible to form a three-dimensional solid pattern by the magnetic pigment on the surface of the product. As the product, plastic products such as ABS and ABS / PC have excellent compatibility with polyurethane, which is a material of the coating layer, and can be easily bonded by secondary bonding force (hydrogen bond, van der Waals bond, etc.).

5 is a view showing the principle of forming a three-dimensional solid pattern by the magnetic pigment, when the magnetic field is formed by the electromagnet 31 of the mold 12, the ferrite magnetic particles in the paint are arranged according to the magnetic field pattern Will form.

In this way, the present invention is to implement a three-dimensional three-dimensional pattern consisting of a magnetic pigment array in the product coating film (surface coating layer) by arranging the magnetic pigment contained in the paint in accordance with the magnetic field, low temperature low pressure in the mold polyol, curing agent, magnetic pigment By injecting and imparting a magnetic field with a specific pattern, the magnetic pigments in the paint are arranged in the same shape as the magnetic field to form a pattern, and the pattern is fixed by using a urethane reaction of a polyol and a curing agent. Through this, it is possible to obtain a good film with good clarity and to implement various patterns and to improve design freedom.

1 is a process chart showing a self-painting process according to the present invention,

Figure 2 is a schematic diagram showing a state in which the raw material supply and polyurethane reaction injection is made in the self-painting apparatus according to the present invention,

3 is a schematic view showing a state in which the magnetic pigments are arranged at the time of applying a magnetic field in the magnetic coating apparatus according to the present invention,

4 is a schematic view of a state in which a pattern is formed in the self-painting apparatus according to the present invention,

Figure 5 is a view showing the principle of forming a three-dimensional solid pattern by a magnetic pigment in the present invention.

<Explanation of symbols for the main parts of the drawings>

7: injection molding machine 11: the first mold

12: 2nd mold 20: semi-finished product

30 magnetic field generating mechanism 31 electromagnet

32: control unit

Claims (7)

Molds 11 and 12 capable of being opened and closed such that the semi-finished product 20 is put in and the finished product can be taken out; A magnetic field generating mechanism (30) installed in the mold (12) on the surface of the semi-finished paint in the molds (11, 12) and forming a magnetic field for the arrangement of the magnetic pigments; An injection mechanism including a nozzle (7) for injecting a polyurethane composition containing a magnetic pigment into the filling space in the mold (12) toward the semi-finished paint surface; And, When the polyurethane composition containing the magnetic pigment is injected into the semi-finished paint surface in the mold 12 by the nozzle 7, the coating layer is formed, the magnetic field generating mechanism 30 forms a magnetic field, and the magnetic pigment in the coating layer Magnetic coating apparatus for forming a three-dimensional pattern characterized in that the three-dimensional pattern is formed at the same time as the urethane reaction while being arranged according to the magnetic field shape. The method according to claim 1, The magnetic field generating mechanism 30 includes an electromagnet 31 disposed in consideration of a desired magnetic field shape and a pattern shape in the mold 12 on the surface of the semi-finished product, and a control unit for controlling a power applied to the electromagnet 31 ( 32) self-painting apparatus for forming a three-dimensional pattern, characterized in that consisting of. The method according to claim 2, The electromagnet 31 is a self-painting device for forming a three-dimensional pattern, characterized in that the coil is superposed on the iron core and inserted into the magnet mounting space provided in the mold is installed. The method according to claim 2, The control unit 32 is a self-painting apparatus for forming a three-dimensional pattern, characterized in that it is provided to apply a pulse current of 1000 ~ 2000 ㎌, 500 ~ 1000 V to the electromagnet 31 for 1 to 3 seconds. Mounting a semifinished product in a mold; Injecting a polyurethane composition comprising a magnetic pigment into the filling space in the mold toward the semi-finished paint surface by using a nozzle; Forming a three-dimensional pattern by applying magnetic power to an electromagnet installed in a mold on the surface of the semi-finished product and arranging magnetic pigments according to the shape of the magnetic field simultaneously with the urethane reaction of the polyurethane composition; Taking out the product in a state where the three-dimensional pattern by the magnetic pigment is fixed after curing of the polyurethane resin; Self-coating method for forming a three-dimensional pattern comprising a. The method according to claim 5, The magnetic pigment is a magnetic coating method for forming a three-dimensional pattern, characterized in that the ferrite (ferrite) magnetic pigment. The method according to claim 5, Self-painting method for forming a three-dimensional pattern, characterized in that by applying a pulse current of 1000 ~ 2000 ㎌, 500 ~ 1000 V to the electromagnet for 1 to 3 seconds in the process of applying power to the electromagnet.

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