KR20140003948A - Method for coating a film on a board after the pre-treatment using uv hardening pigments - Google Patents

Abstract

The purpose of the present invention is to provide a method for adhering a film on a board after pre-treatment using a UV hardening paint, which provides superior smoothness and adhesion. The method for adhering a film on a board according to the present invention comprises a primer coating step of coating the surface of a board with a primer at a predetermined thickness (S2); a drying step of drying the primer by IR irradiation and hot wind or irradiating the primary coating layer with UV rays (S3); a wood sealer coating step of coating the dried primer layer with a UV paint wood sealer (S4); and a UV irradiation step of UV hardening the coated wood sealer (S5). [Reference numerals] (S1) Substrate polishing step; (S10) Poly film adhesion step; (S2) Primer coating step; (S3) Drying step; (S4) Wood sealer coating step; (S5) UV irradiation step; (S6) Sanding sealer coating step; (S7) UV irradiation step; (S8) Primary sanding step; (S9) Urethane adhesive coating step

Description

TECHNICAL FOR COATING A FILM ON A BOARD AFTER THE PRE-TREATMENT USING UV HARDENING PIGMENTS}

The present invention relates to a method of adhering a film to a plate, and more particularly, to a method of adhering a film after pretreatment using an ultraviolet curable paint to a plate such as MDF.

MDF (Medium Density Fiberboard) is, the wood fiber is obtained by fibrillation at a high temperature to the wood-based material as a main raw material (Wood Fiber) was coupled to the molding of a synthetic resin adhesive, a hot-press made by density 0.4-0.8g / cm ³ of wood plate-like product is 3.0mm Up to 30mm thickness can be produced.

This enables uniform fiber distribution over the entire thickness and dense structure, enabling complex machining operations without face or side rupture, so MDF is used for table tops, doors, drawer fronts, etc. do. It is also smooth and firm on the surface and is ideal for overlaying or painting decorative films or veneers. Its excellent stability, machinability and high strength make it an alternative to ordinary wood for drawers, cabinet rails, mirror frames and moldings.

However, since it is weak to moisture, it is necessary to surface-treat by methods such as film adhesion or coating.

As a conventional method of surface coating of such MDF plate material, such as Korean Patent No. 733606 is disclosed. As shown in FIGS. 1 and 2, the polyfilm 12 and the roller fixed to the support 11 after the undercoat step of applying a transparent urethane paint to a material 14 such as wood, steel, acrylic, glass, etc. (R) is a surface coating method for coating the surface of the material (14) with the ultraviolet paint (13), and after the undercoating step is performed, the ultraviolet paint partially on the material surface of wood, steel, acrylic, glass Pouring paint injection step (S10); A film preparation step (S20) of covering the poly film on the material surface on which the UV paint is poured; After the film preparation step, by placing the roller on the upper side of the poly film and the UV paint coating step of coating the UV paint partially poured on the material surface while rolling the roller (S30); After the UV paint coating step, the material curing step of curing the UV paint on the surface of the material is coated UV coating using an ultraviolet emitting device (S40); After the paint curing step, it is characterized by consisting of the surface coating completion step (S50) to complete the surface coating by removing the poly film.

According to the method of the first prior art, it is not necessary to use a costly installation method such as curtain coating method, and after pouring the UV paint on the material, the polyfilm is placed on top of the UV paint and only by rolling the rollers. Ultraviolet paint is filled in the grooves created by the impact of external forces and the wound of the material itself, and the UV paint is pressurized by the rolling of the roller, and the UV paint on the surface of the material is painted to a certain height. In addition, the surface of the material is smooth and glossy and has the advantage of showing a flat plane. In addition, there is an advantage that the waste of ultraviolet ray paints can be reduced and the surface treatment of relatively flat surfaces is possible.

However, when coating a colored ultraviolet paint on wood and exposing it to ultraviolet light to cure the ultraviolet paint, the method does not transmit ultraviolet light, so that the ultraviolet paint is not easily cured, and when the ultraviolet paint is colored, Since the colored UV paint transmits UV light differently depending on the color, when the thickness of the UV paint coated on the wood is thickly coated, the colored UV paint is not easily cured, and various colored UV light is applied to the wood. There was a problem that can not paint. In addition, since the method removes the poly film after curing, it is not environmentally friendly, it is difficult to form a variety of patterns, and there is a problem that the scratch is also weak.

On the other hand, as a second conventional technology for solving the above problems by leaving the film as it is after the ultraviolet paint is cured, a technique such as Korean Patent No. 929151 is disclosed.

As shown in FIGS. 3A and 3B, the coating mixture composition is dropped on the object to prevent defective products due to bubbles generated in the coating mixture composition during the preparation of the coating mixture composition and the treatment of the coating mixture composition. After lowering, the subject is passed between the plastic film and the coating roller at the same time while providing a method of coating a high gloss (Super Gloss) by adjusting the coating thickness to the roller height.

That is, to prepare a coating composition to obtain a high gloss uniform coating film (S10); Preparing a reaction initiator mixture (S20); Preparing a coating mixture mixture manufacturing step (S30) by mixing the reaction initiator mixture with the coating composition; Coating agent mixture composition step of adding the promoter (S31); A coating step (S40) of dropping the coating composition 40 on the product 30 to be coated and simultaneously passing between the plastic film 10 and the coating rollers 20a and 20b; And a curing step (S50) of the hot wind curing treatment after the coating. And a control unit.

According to the high-gloss coating method according to the second prior art, it is possible to high-gloss coating on the coating products of various forms, it is also possible to significantly reduce the defective rate due to the bubble by the coating treatment using the film, the second prior art The coated product 50 by the high gloss coating method according to the excellent weather resistance, by improving the durability by increasing the surface hardness, it can be applied to the manufacture of high-gloss mobile phones, notebook computers, automotive interior, building materials and the like.

However, when the first and second techniques are applied to a relatively non-smooth coated product such as MDF, the smoothness of the MDF itself is not good, so there is a limit of the smoothness even in the coated product. In the case of the prior art, there is a limit in the adhesion between the ultraviolet paint and the MDF.

Republic of Korea Patent No. 733606 (Name: surface coating method) Republic of Korea Patent No. 829151 (Name: High gloss coating method and high gloss coating product manufactured using the same)

The present invention has been made to solve the above problems, and its object is to provide a method for adhering a film after pretreatment using an ultraviolet curable paint to a plate, which has more excellent smoothness and adhesion.

Method for adhering the film after pretreatment using ultraviolet curable paint to a plate such as MDF according to the present invention for achieving the above object, Primer coating step (S2) for applying a primer to a surface of the plate to a predetermined thickness; A drying step of drying the primer by applying infrared irradiation and hot air or ultraviolet irradiation on the applied primer coating layer; Woodsila coating step (S4) for coating the wood-silsa of UV paint on the curing-dried primer layer; And an ultraviolet irradiation step (S5) for UV curing the coated woodsila. And a control unit.

Preferably, after the ultraviolet irradiation step (S5), the sanding chamber coating step (S6) for applying a sanding thread to a predetermined thickness; And an ultraviolet irradiation step (S7) for UV curing the applied sanding thread. And further comprising:

Also preferably, before the primer application step (S2) characterized in that it further comprises a minor polishing step (S1).

More preferably, it is similar to the basic polishing step before adhering the film, characterized in that it further comprises a lower sanding step (S8) is a finer sanding is made.

Also preferably, the step of adhering the film, urethane adhesive coating step (S9) for applying a urethane adhesive on the surface after the pretreatment; And after the urethane adhesive coating step (S9) characterized in that consisting of a polyfilm adhesive step (S10) to put a poly film on the undersurface to which the urethane adhesive is applied to perform a roll press.

Also preferably, it is characterized in that the wood silas coating step (S4) divided into several times.

Most preferably, at least one reverse wood sila coating step (S5-1, S5-2) and the corresponding UV irradiation step (S5-2, S5-4), at least before the wood sila coating step (S4) It is characterized in that one more direct wood silas coating step (S5-5) and the ultraviolet irradiation step (S5-6) accordingly are further performed.

According to the method of adhering a film after pretreatment using an ultraviolet curable coating material to a sheet according to the present invention, an MDF sheet having excellent smoothness and adhesion can be produced.

Other objects and advantages of the present invention will become apparent from the detailed description of the embodiments with reference to the attached drawings.

1 is a flow chart illustrating a first conventional sheet surface coating method.
2 is a view for explaining a conventional sheet surface coating method.
Figure 3a is a process chart for a high gloss coating method according to the second conventional.
Figure 3b is a view showing the process of the coating step using the film and the roller of the high-gloss coating method using a coating composition in the second conventional.
Figure 4 is a flow chart showing a method of adhering the film after pretreatment using an ultraviolet curable paint on a plate according to an embodiment of the present invention.
FIG. 5 is a flowchart illustrating additional wood sila steps in a method of adhering a film after pretreatment using an ultraviolet curable paint to a plate according to another embodiment of the present invention. FIG.
6 and 7 are photographs for contrasting the surface smoothness of the MDF plate according to the conventional plate surface coating method and the plate surface coating method of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 4 to 6. FIG. Figure 4 is a flow chart illustrating a method of bonding the film after pre-treatment using a UV-curable paint on the plate according to an embodiment of the present invention, Figure 5 is a pre-treatment using a UV-curable paint on the plate according to another embodiment of the present invention Among the methods of adhering the film, it is a flow chart showing the additional wood sila step, Figure 6 and Figure 7 is a photograph that contrasts the surface smoothness of the MDF plate according to the conventional plate surface coating method and the plate surface coating method of the present invention, Each (b) is an object reflection picture of the MDF plate material according to the conventional plate surface coating method, (a) is an object reflection picture of the MDF plate material according to the plate surface coating method of the present invention.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In addition, preferred embodiments of the present invention will be described below, but the technical idea of the present invention is not limited thereto, but may be variously modified and modified by those skilled in the art.

First, the first method of adhering the film after the pretreatment using the ultraviolet curable paint on the plate applied to the present invention, as shown in Figure 4, the polishing step (S1), primer coating step (S2), drying step (S3) ), Wood sila coating step (S4), UV irradiation step (S5), sanding coating step (S6), UV irradiation step (S7), bottom coating step (S8), urethane adhesive coating step (S9), polyfilm adhesion It includes a step (S8), described in detail below for each step as follows.

< Step 1: Ground polishing  step >

The polishing step (S1), which is one of the pretreatment processes, is a process of sanding sandpaper, which is also called white bone sanding, and the mesh of the sandpaper is 120 to 320 meshes, preferably 180 to 220 meshes.

< Step 2: primer  Application step >

The primer coating step, which is another one of the pretreatment processes, is performed after the base polishing step. For example, 'FPI 33 ISOLATOR' of DGK may be used, which is based on a special vinyl-modified resin and additives developed by DGK. It is a two-component urethane paint made of polyisocyanate as a curing agent, and is an adhesion promoter isolator paint which strengthens the adhesion between wood base material and UV paint.

The isolator is primarily intended to block rosin or wood gin, but also serves to strengthen the adhesion between the plate and the UV and urethane paint, the purpose of the process of applying the primer is primarily MDF When used for the purpose of strengthening the MDF and adhesion, and when used on the secondary wood has the effect of blocking the wood.

That is, the primer of this process is a primer for promoting adhesion between the special base material such as MDF, thin paper, LPM, HPM and the like.

The primer is preferably applied to the surface of the MDF in the state of the white bone polishing in a thickness of 10 to 15 g / m 2, and the coating method may be various, but is preferably applied using a roll.

< Third step: drying step >

Drying step (S3) is a step for drying the applied primer, by applying hot air for approximately 5 to 15 seconds to dry the primer applied in the step S2. In addition, it is also possible to enhance the drying effect by simultaneously performing infrared (IR) irradiation with hot air.

< Step 4: Woodsila  Application step >

Next, the wood sila coating step (S4) is a step of coating a full-scale UV paint on the cured and dried primer layer, which is added to the reactive oligomer monomer photoinitiator absorbing a wavelength of 320 ~ 450 nm, Constitutional pigments may be added. It is also preferable to be coated by a coating roll, and for example, 'Ubi-rak 100 Woodsila transparent' UV curable product of Dye Paint can be used.

Here, the coating amount is preferably applied to a thickness of 20 ~ 130 g / ㎡. In addition, the present wood sila coating step (S4) may include a number of detailed steps, which will be described later.

The reason why the wood sila coating step and the ultraviolet ray irradiation step described below is used is that the wood silla is excellent in adhesiveness and ensures transparency. However, since fine unevenness exists, it is preferable to add the sanding chamber process mentioned later.

< 5th step: UV irradiation step >

Thereafter, as described above, the ultraviolet irradiation step (S5) for UV curing the coated wood sila is performed, the ultraviolet ray of approximately 320 ~ 450nm wavelength is preferably irradiated for 3 to 5 seconds.

< Step 6: Sanding Sila  Application step >

After the sanding coating step (S6) is carried out, for example, sanding sealer, such as' Ubi-rak 200 sanding shilling Co., Ltd. of the light control paste to a thickness of approximately 40 ~ 60 g / ㎡, also using a coating roll bar, This is to ensure that the sanding is well done during sanding even if it is to be done later.

The paint used for the sanding sealer also uses the same paint as the paint used for the wood sealer, except that an abrasive which is a extender pigment is added. The reason is that the paint used in the wood sila process has the advantage of being transparent and excellent in adhesiveness, but there may be fine unevenness, so that the surface should be flattened by polishing. There is a problem in that it does not support, so that the sanding is added to the sanding sealer is added to the abrasive, such as a sieving pigment, so that the sanding is made well when sanding.

< Step 7: UV irradiation step >

Then, as described above, the ultraviolet irradiation step (S7) for the UV curing of the applied sanding bar is performed, the ultraviolet ray of approximately 320 ~ 450nm wavelength is preferably irradiated for 3 to 5 seconds.

< 8th step: sanding  step >

The bottom sanding step S8, which is the last of the pretreatment process, is similar to the above-described sanding step, but the mesh of the sandpaper is 320 to 400 meshes, and preferably 320 to 360 meshes for finer sanding. .

According to the present sanding sanding process, most of the sanding thread is polished, and thus a smooth surface can be easily made while the smoothness is very high.

< 9th step: urethane adhesive coating step >

The pretreatment process is now complete, and a urethane adhesive application step (S9) of applying an adhesive such as polyurethane to an even surface having almost no unevenness or fine grooves is performed.

More specifically, the adhesive is PUR (Polyurethane Reactive), for example, a coating roll of a urethane adhesive, such as PUR product name 'HB 9648F' of 'HB Filler' of the United States to approximately 10 to 60 g / ㎡, also coating roll Apply using

The reason why the adhesive at this stage is a urethane adhesive of PUR series is because it is excellent in adhesiveness with a polyfilm such as PET or PVC described later.

< Step 10: Polyfilm  Bonding step >

Lastly, poly film adhesion step in which roll press is carried out by putting eco-friendly films such as PET and PVC film on MDF coated with polyurethane adhesive (PUR: Polyurethane Reactive) in step S9. Is carried out.

Therefore, the adhesive directly contacting the poly film uses PUR of the same series, while the contacting area with the MDF uses a primer (isolator) excellent in adhesion with the MDF, and again, a wood sila having good adhesion between the urethane adhesive and the primer. Since it is used in the middle, the adhesiveness is much superior to the prior art, and furthermore, since the sanding thread is used to make the sanding well, and also the wood sealer which has excellent adhesion between the sanding thread and the primer is used in the middle, also smoothness And MDF surface treatment with excellent adhesion.

After that, the packaged surface-treated MDF is packaged and shipped.

Next, the second method of adhering the film after the pretreatment using the ultraviolet curable paint on the plate applied to the present invention, as shown in Figure 4, the polishing step (S1), primer coating step (S2), drying step (S3) ), Wood sila coating step (S4), UV irradiation step (S5), sanding coating step (S6), UV irradiation step (S7), bottom coating step (S8), urethane adhesive coating step (S9), polyfilm adhesion Including the step (S10), the wood silas coating step (S4) is carried out by dividing into several stages, the first reverse woodsilla coating step (S5) is further performed before the woodsilla coating step (S4) below -1), ultraviolet irradiation step (S5-2), the second reverse woodsila coating step (S5-3), ultraviolet irradiation step (S5-4), direct woodsila coating step (S5-5), ultraviolet irradiation step ( The detailed description of each step of S5-6) is as follows.

The first reverse wood silas coating step (S5-1), the second reverse wood silas applying step (S5-3) and the direct wood silas applying step (S5-5) are almost similar to the wood silas applying step (S4), In the second method, in order to further improve the smoothness of the MDF surface, in the first and second reverse woodsila coating steps (S5-1, S5-3), the direction of the coating roll (that is, the coating direction) is changed to the direct woodsila. By performing the reverse operation of the application step (S5-5), the wood sila coating and curing is performed in both directions. The final wood sila coating step S5 may be a reverse wood sila or a direct wood sila depending on the situation.

Preferably, the coating amount of the first reverse wood sila coating step (S5-1) is 30 ~ 40 g / ㎡, the coating amount of the second reverse wood sila coating step (S5-3) is 20 ~ 30 g / ㎡, direct wood The coating amount of the sila coating step (S5-5) is 20 ~ 30 g / ㎡, and the coating amount of the final wood sila coating step (S5) is preferably set to 20 ~ 30 g / ㎡.

In addition, UV irradiation step (S5-2, S5-4, S5-6 and S5) for UV curing the coated wood sila is irradiated with ultraviolet light of approximately 320 ~ 450nm wavelength for several minutes.

According to the method for adhering the film after pretreatment using the UV curable paint to the plate according to the present invention, since the polyfilm is adhered in the state of applying the primer, curing drying and wood silly coating and curing, the paint loss is low, and the diluent Monomers are environmentally friendly because they are directly involved in the film formation and are 100% solid, with no volatile content, and have the advantage of improved adhesion by primers and woodsila. There is an additional advantage of being high, and in addition to repeating the woodsila several times, but more effective woodsila is performed by changing the coating direction to reverse woodsila and direct woodsila.

6 and 7 are photographs for contrasting the surface smoothness of the MDF plate according to the conventional plate surface coating method and the plate surface coating method of the present invention, each (b) of the MDF plate according to the conventional plate surface coating method The object reflection photograph, (a) is an object reflection photograph of the MDF plate according to the plate surface coating method of the present invention.

In the case of the MDF plate according to the conventional plate surface coating method, as shown in (b) of FIG. 6, the reflected branch pattern is significantly refracted or distorted, but the MDF according to the plate surface coating method of the present invention. It can be seen that the pattern reflected on the surface of the sheet material has a remarkable difference that distortion does not occur as much as that reflected on the glass surface (see FIG. 6A).

In addition, in the case of the MDF plate according to the conventional plate surface coating method, as shown in Figure 7 (b) is considerably distorted so as not to know what is the fluorescent lamp light, according to the plate surface coating method of the present invention Fluorescent lamp light reflected on the surface of the MDF plate is relatively close to a straight line, it can be seen that also has a significant difference (see Fig. 7 (a)).

Such a difference is that the thickness of the MDF plate according to the conventional plate surface coating method of FIGS. 6 and 7 is about 20 mm, whereas the thickness of the MDF plate according to the plate surface coating method of the present invention is only about 12 mm. In consideration of the fact that the same thickness brings about a greater difference in smoothness, it can be seen that the effect of the present invention is much more significant than in the prior art.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Of course.

Claims (7)

Primer application step (S2) for applying a primer to a surface of the plate to a predetermined thickness;
Drying step (S3) to dry the primer by applying hot air or ultraviolet irradiation on the applied primer coating layer;
Woodsila coating step (S4) for coating the wood-silsa of UV paint on the curing-dried primer layer; And
UV irradiation step (S5) for UV-curing the coated wood sila;
Method for adhering the film after pretreatment using an ultraviolet curable paint on a plate, characterized in that it comprises a. The method of claim 1,
After the ultraviolet irradiation step (S5), the sanding chamber coating step (S6) for applying a sanding thread to a predetermined thickness; And
UV irradiation step (S7) for UV curing the applied sanding sealer;
Method for adhering the film after pretreatment using an ultraviolet curable paint on a plate, characterized in that it further comprises. The method of claim 1,
A method of adhering the film after pretreatment using an ultraviolet curable paint on a plate, characterized in that it further comprises a polishing step (S1) before the primer coating step (S2). The method of claim 3, wherein
A method of adhering the film after pretreatment using a UV-curable paint to a plate, which is similar to the basic polishing step, but further includes a sanding step (S8) in which finer sanding is performed before the film is adhered. The method of claim 1,
The process of adhering the film,
Urethane adhesive coating step (S9) for applying a urethane adhesive on the surface after the pretreatment; And
Poly film adhesion step (S10) to put a poly film on the undercoat to which the urethane adhesive is applied after the urethane adhesive coating step (S9) to perform a roll press;
A method of adhering a film after pretreatment using an ultraviolet curable coating material to a plate material comprising a. The method of claim 1,
Method for adhering the film after pre-treatment using a UV-curable paint on a plate, characterized in that the woodseal coating step (S4) divided into several times. The method according to claim 6,
Prior to the wood sila coating step (S4), at least one reverse wood sila coating step (S5-1, S5-2) and the UV irradiation step (S5-2, S5-4), and at least one direct wood sila A method of adhering the film after pretreatment using an ultraviolet curable paint to a plate, characterized in that the coating step (S5-5) and the ultraviolet irradiation step (S5-6) are further performed.

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