KR100829151B1 - Coating method for Super Gloss Coating and Products manufactured thereby - Google Patents

Abstract

The present invention relates to a super gloss coating method for coating the coating composition by simultaneously passing the coating composition between the plastic film and the coating roller, and more specifically, to mix the coating composition to obtain a high gloss uniform coating film. After the reaction mixture is mixed with the coating composition to prepare a coating composition, the coating composition is dropped onto the product to be coated and simultaneously passed between the plastic film and the coating roller to coat the coating, It relates to a high gloss coating method of hot air curing after the coating treatment.

Since the high gloss coating method according to the present invention is used, high gloss coating is possible on various types of coating products, and the coating rate using the film can significantly reduce the defect rate caused by bubble generation. By producing excellent weather resistance, and improve the durability by increasing the surface hardness, it can be applied to the production of high-gloss mobile phones, notebook computers, automotive interior, building materials and the like.

High gloss coating, film, roller

Description

High gloss coating method and high gloss coating product manufactured using the same {Coating method for Super Gloss Coating and Products manufactured thereby}

1 is a process chart for a high gloss coating method according to the present invention.

2 is a view showing the process of the coating step using the film and the roller of the high gloss coating method using the coating composition mixture.

The present invention relates to a super gloss coating method for coating a coating film by simultaneously passing a coating composition between a plastic film and a coating roller, and more particularly, to mix a coating composition to obtain a high gloss uniform coating film. After preparing a coating mixture composition by mixing a reaction initiator mixture with the coating composition, the coating mixture composition is dropped on a subject (the product to be coated, hereinafter referred to as a 'subject'), and a plastic film and a coating roller. The present invention relates to a high gloss (Super Gloss) coating method comprising a step of simultaneously passing through and coating the coating film, followed by a hot air curing treatment.

Conventionally, thermosetting powders using acrylic copolymer and polyepoxide as base materials are solid and glossy, excellent in adhesion, flexibility and impact resistance, and excellent resistance to caustic soda and salt spray, caustic soda and organic solvents. A study on a coating composition and a thermosetting coating method using the composition (registration notification number: 10-1995-0005344) has been attempted, and recently, not only wood products but also synthetic polymers using lacquer (Korea Patent Publication No. 2000-0024493) Various coating products using various functional applications such as ceramics and metal containers (Korean Patent Publication No. 2002-0072903) have been studied. Of course, the present applicant also recently received a patent for the coating method of the metal sheet using lacquer (patent registration number: 0536953), and applied for a coating method based on the material using a number of other functional uses, etc. I've done it.

However, the coating method based on the material using the plurality of functional uses, and the thermosetting powder coating composition and the thermosetting coating method using the composition improve various color and harmful electromagnetic waves and solid durability due to the addition of the functional material. The purpose of the present invention is to provide a coating method for producing the coating agent. However, bubbles are generated in the coating process using the coating agent, and a poor coating product is generated due to bubbles, and the durability of the coating decreases due to such bubbles. However, there are many difficulties in manufacturing high gloss coating products.

The present invention has been made in order to solve the problems of the prior art, in order to prevent the production of defective products due to bubbles generated in the coating composition when the coating mixture composition and the coating mixture composition treatment, mixing the coating agent It is an object of the present invention to provide a method of super gloss coating by dropping a composition onto a subject and then adjusting the coating thickness at the height of the roller while simultaneously passing the subject between the plastic film and the coating roller.

It is another object of the present invention to provide a coating product manufactured by a high gloss (Super Gloss) coating method using the film.

The high gloss coating method according to the present invention for achieving the above-described technical problem, mixing the coating composition to obtain a high gloss uniform coating film; Preparing a coating mixture composition by mixing a reaction initiator mixture with the coating composition; A coating step of dropping the coating mixture composition on the product to be coated and simultaneously passing the film between the plastic film and the coating roller; And a curing step of hot-curing the coating process. Characterized in that comprises a.

The coating composition used in the super gloss coating method is polymethyl methacrylate (hereinafter referred to as PMMA) 1-9: methyl methta to have a viscosity of 50 to 250 poise in order to obtain a high gloss uniform coating film. It is characterized in that the methacrylate (Methyl methacrylate, hereinafter referred to as MMA) 9 to 1 by weight ratio. However, in addition to the coating composition, paints which do not contain organic solvents such as UV paints or urethane paints, paints by polymerization reaction, etc. can also be used.

In another aspect of the present invention, the reaction initiator is a compound capable of radical formation of a peroxide structure, the reaction initiator is called Dilauric Peroxide, Laurox (hereinafter referred to as 'DPO') or benzoyl peroxide ( Benzoil Peroxide, hereinafter referred to as 'BPO'.

And, to facilitate the dissolution of the reaction initiator, methyl ethyl ketone (Methyl Ethyl Ketone: hereinafter referred to as 'MEK') 1-4: Xylene (Xylen) 1-4: DPO 1-4 by mixing in a weight ratio of, It is characterized by preparing a reaction initiator mixture by heating in a bath at 40-80 ℃.

According to another aspect of the present invention, after the preparation of the reaction initiator mixture composition, dimethyl-beta-propiotetin (Dimethy1-β-) in 6-10 Kg% by weight of the coating composition and 100-400 g% by weight of the reaction initiator mixture. propiothetin, hereinafter referred to as 'DMPT'), characterized in that it further comprises a catalyst for further mixing by stirring to add a stirring agent of 40 to 40g.

Another configuration of the present invention, the curing step is characterized in that the curing by hot air treatment at a radical polymerization reaction at 40 -80 ℃.

Another configuration of the present invention is characterized in that the curing treatment is cured by a polymerization reaction by hot air heating at 50-60 ° C. for about 5 to 7 hours.

Another configuration of the present invention, the film during the coating process is characterized in that using a polyethylene terephthalate film (Polyethelene terephthalate FILM, hereinafter 'PET' film), the coating thickness is characterized in that 20-400 ㎛ It is done.

Another configuration of the present invention is characterized in that the high-gloss coating product manufactured by coating the high-gloss coating method.

Hereinafter, the present invention will be described in more detail with reference to the drawings, examples, test results and the like.

In the present invention, as shown in Figure 1, S10) step of preparing a coating composition for mixing the raw material of the coating mixture composition, S20) preparing a reaction initiator mixture, S30) mixing the reaction initiator mixture in the coating composition coating agent Preparing a mixed composition, or S31) preparing a promoter-added coating mixture composition in which a DMPT (Dimethyl-β-Propiothetin) promoter is added to and mixed with the coating mixture composition; S40) coating the mixture composition of the step S30, or S31) on the product to be coated; S50) provides a high gloss coating method comprising the step of curing the coating product of the S40) coating step. The present invention also provides a high gloss coating product coated by the above method.

Hereinafter, the coating method according to the present invention will be described in detail step by step.

In order to coat according to the coating method according to the present invention, first, polymethyl methacrylate (hereinafter referred to as 'PMMA') 1 to 9: methyl methacrylate (hereinafter referred to as 'MMA') is mixed in a 9 to 1 weight ratio. It is preferable to heat until PMMA melt | dissolves, stirring at 40-80 degreeC. (Poly-methyl methacrylate) resin used in the present invention is a polymer of methyl methacrylate (Methyl methacrylate), polymerizing only MMA alone or bulk polymerization, suspension polymerization or solution polymerization of MMA and a small amount of other acrylate monomers It is a resin produced by curing the copolymerization by the method of, and used as a paint. PMMA resin not only has excellent transparency and weather resistance, but also has excellent mechanical strength such as tensile strength and elastic modulus, surface gloss, chemical resistance, adhesiveness, etc., so that it can be used for decorative products, signboards, lighting materials, various building materials, adhesives, and other plastic materials. It is widely used as a modifier, and because of its excellent transparency, it is manufactured in the form of a sheet of sheet and is widely used as a substitute for glass. The main constituents used in the present invention are mixtures of the weight ratios of PMMA 1-9 to MMA 9-1 and are not used as additives for lacquer. In addition, as a reaction initiator of the polymerization reaction used in the present invention, a compound capable of radical formation of a peroxide structure is used, and in particular, Dilauric Peroxide (hereinafter referred to as 'DPO') or benzoyl peroxide When one of the side (Benzoil Peroxide, hereinafter referred to as 'BPO') is selected and added, curing occurs. The DPO and BPO are commonly used as a polymerization initiator for the polymerization of MMA monomers into PMMA. As it is being used, we did not list in the detailed explanation of this invention in particular.

Example 1 PMMA 4: Coating Method by MMA 6 Coating Composition

end. Coating composition and its proportion selection

Among them, the weight ratio of the most preferred coating composition was PMMA 4: MMA 6, 400 g of PMMA and 600 g of MMA were mixed and heated at 50 ° C. with a magnetic stirrer for 2 hours with a hot water bath to completely dissolve PMMA and measure the viscosity. It was 136 poise.

At this time, when the ratio of PMMA is too high, the viscosity is high, and when the ratio of MMA is high, the viscosity is low. At this time, if the viscosity is too low, the coating mixture composition flows after coating to obtain a uniform coating thickness, and if the viscosity is too high, supply of raw materials is difficult and bubbles in the coating mixture composition are not discharged out, thereby increasing the defective rate.

I. Step of preparing a reaction initiator mixed composition

MEK (Methyl Ethyl Ketone) 1-4: Xylene (XYLEN) 1-4: DPO 1 ~ 2 The mixture is mixed, and heated to a hot bath until the DPO is completely dissolved while stirring at 40 ~ 80 ℃. At this time, MEK 2: xylene 1: DPO (Laurox) 1 is the most suitable mixture. In this case, the reaction initiator is a substance having a peroxide structure, such as BPO (Benzoil peroxide) in addition to DPO can be used a compound capable of radical formation. At this time, the reason for mixing MEK and xylene is to facilitate the dissolution of DPO (Laurox), and to mix well with the coating composition. In this case, if the content of the solvent is too high, it is difficult to volatilize the solvent after the coating is completed, and if the content of the solvent is too small, it is difficult to dissolve the DPO. At this time, if the heating temperature is too low, the dissolution rate of DPO is slow, and if the temperature is too high, the solvent may volatilize.

All. Mixing step of the coating composition and the reaction initiator mixed composition

6 to 10 kg by weight of the coating composition is mixed with 100 to 400 g by weight of the reaction initiator mixture composition, and stirred for 30 minutes or more, 5 to 40g% by weight of the promoter DMPT is added, and further stirred for 30 minutes or more. . In this case, the weight ratio of 200 g% by weight of the DPO mixture and 18 g% by weight of the DMPT is most suitable for 8 kg by weight of the coating composition. If the weight ratio of the DPO mixture and the DMPT is too high, the polymerization reaction may proceed quickly, resulting in coating cracks. If it is too small, hardening takes a long time and productivity falls.

la. Coating steps

The coating is applied to the height of the rollers 20a and 20b while dropping the coating mixture composition 40 onto the product to be coated and passing between the rollers 20a and 20b as the plastic film 10, as illustrated in FIG. The thickness of the coating is adjusted to 20 ~ 400㎛. Products to be coated (substrate, 30) can be coated on a variety of materials, such as metal plate, plastic plate, paper wood. In this process, bubbles are generated inside the mixing process of the coating composition, and bubbles are not mixed in the product during the coating process, thereby significantly reducing the defect occurrence rate. At this time, if the coating thickness is too thin, uncoated defects may occur and gloss deterioration may occur, and if the coating thickness is too thick, bubbles may be mixed to cause high defects. In addition, various gloss products can be obtained depending on the surface state of the film. High gloss products can be obtained by using films with good surface roughness, and matt or semi-gloss products can be obtained without matting agents by using films with rough surfaces. In this case, it is appropriate to use a PET (Polyethelene terephthalate) film. At this time, the coating composition is not limited to the coating composition, UV coating or urethane Paints which do not contain an organic solvent, such as paints, and paints by a polymerization reaction can also be used.

hemp. Curing step

The curing step is heated by hot air at 40 ~ 80 ℃ to cure by radical polymerization reaction. If the initial critical temperature is low, the reaction is slow. If it is too high, the reaction rate is slow because of the exothermic reaction. More preferably, it is preferable to cure at 50 to 60 ° C for 5 to 7 hours.

Test Example 1 PMMA 4: Coating of Al and ABS plate by MMA 6 coating composition

400 g% by weight of PMMA and 600 g% by weight of MMA were mixed and heated in a bath for 2 hours while stirring with a magnetic stirrer at 50 ° C. to completely dissolve PMMA and measure the viscosity, which was 136 poise. In addition, 40 g% by weight of MEK, 20 g% by weight of xylene, and 20 g% by weight of DPO were mixed in a glass bottle and shaken for 15 minutes in 50 ° C. water to completely dissolve the DPO. After mixing 25 g% by weight of the reaction initiator mixture to 1 kg of the coating composition, the mixture was stirred for 30 minutes with a stirrer, and then 2.25 g% by weight of DMPT was added thereto, followed by further stirring for 30 minutes. The coating composition was mixed with Al and ABS plates with a thickness of 100 μm. At this time, 75 μm thick PET FILM was used. The coated Al plate and ABS plate were heated by hot air heating at 50 ° C. for 6 hours to cure the coating. The test results of this product are shown in Table 1 below.

division Pencil hardness Glossiness Defect Number Weather resistance Wear resistance Test Methods KS M 5000 KS A 0069 Visually KS R-0021 Canvas friction test Test 3H 88% 0/100 / 100cm2 2000 hours passed 3000 passes Control HB 75% Foreign object defect 10EA / 100㎠ 1600 hours discoloration 1500 possessions

For reference, the control was tested by mixing a curing agent in a 10: 1 weight ratio to the urethane paint by a spray method, spraying the Al plate on a spray plate at 80 ° C. for 1 hour, and drying it.

Example 2 PMM 1: Coating Method by MMA 9 Coating Composition

end. Coating composition and its proportion selection

Among them, the weight ratio of the most preferred coating composition was PMMA 1: MMA 9, that is, 100 g by weight of PMMA and 900 g by weight of MMA were mixed and heated at 80 ° C. for 30 minutes with a magnetic stirrer to completely dissolve PMMA. At this time, when the ratio of PMMA is too high, the viscosity is high, and when the ratio of MMA is high, the viscosity is low. At this time, the viscosity maintains the viscosity of 53 poise, and if the viscosity is too low, the coating mixture composition flows after coating to obtain a uniform coating thickness.If the viscosity is too high, supply of raw materials is difficult and bubbles in the coating mixture composition Since it is not discharged outside, the defective rate increases.

The rest b. Don't do it. The processing of the steps may be performed in the same manner as in the first embodiment. However, what is necessary is just to mix the mixing ratios, such as reaction initiator mixture composition, as follows.

Test Example 2 Coating of Al plate and wallpaper by PMMA 1: MMA 9 coating composition

100 g% by weight of PMMA and 900 g% by weight of MMA were mixed and heated in a hot bath for 30 minutes while stirring with a magnetic stirrer at 80 ° C. to completely dissolve PMMA and measure the viscosity. It was 53 poise. In addition, 20 g% by weight of MEK, 20 g% by weight of xylene, and 20 g% by weight of DPO were mixed in a glass bottle and shaken for 15 minutes in 80 ° C. water to completely dissolve DPO. After mixing 22 g wt% of the reaction initiator mixture to 900 g wt% of the coating composition, the mixture was stirred for 30 minutes with a stirrer, and 4 g wt% of promoter DMPT was added thereto, followed by further stirring for 30 minutes. The coating composition was mixed with the Al plate and the wall was coated with a thickness of 30 μm, and a 75 μm thick PET film was used. The coated Al plate and ABS plate were heated by hot air heating at 50 ° C. for 6 hours to cure the coating. The test results of this product are shown in Table 2 below.

division Pencil hardness Glossiness Defect Number Weather resistance Wear resistance Test Methods KS M 5000 KS A 0069 Visually KS R-0021 Canvas friction test Test 4H 86% 0/100 / 100cm2 2000 hours passed 3000 passes Control HB 75% Foreign object defect 10EA / 100㎠ 1600 hours discoloration 1500 possessions

For reference, the control was tested by mixing a curing agent in a 10: 1 weight ratio to the urethane paint by a spray method, spraying the Al plate on a spray plate at 80 ° C. for 1 hour, and drying it.

Example 3 Coating Method by PMM 9: MMA 1 Coating Composition

end. Coating composition and its proportion selection

Among them, the weight ratio of the most preferred coating composition is PMMA 9: MMA 1, and 900g% by weight of PMMA and 100g% by weight of MMA are mixed and heated in a bath for 3 hours while stirring with a magnetic stirrer at 40 ° C to completely dissolve PMMA and measure the viscosity. It was 251 poise. At this time, when the ratio of PMMA is too high, the viscosity is high, and when the ratio of MMA is high, the viscosity is low. If the viscosity is too low, the coating mixture composition flows after coating to obtain a uniform coating thickness. If the viscosity is too high, supply of raw materials is difficult and bubbles in the coating mixture composition are not discharged out.

The rest b. Don't do it. The processing of the steps may be performed in the same manner as in the first embodiment. However, what is necessary is just to mix the mixing ratios, such as reaction initiator mixture composition, as follows.

Test Example 3 PMMA 9: Coating of 3 Al board and wood by MMA 1 coating composition

900 g% by weight of PMMA and 100 g% by weight of MMA were mixed and heated in a bath for 3 hours while stirring with a magnetic stirrer at 40 ° C. to completely dissolve PMMA and measure the viscosity, which was 251 poise. In addition, 40 g% by weight of MEK, 40 g% by weight of Xylen, and 20 g% by weight of DPO were mixed in a glass bottle and shaken for 15 minutes in 40 ° C. water to completely dissolve the DPO. After mixing 25g% by weight of the reaction initiator mixture to 1kg% by weight of the coating composition, the mixture was stirred for 30 minutes with a stirrer, and 0.8g% by weight of promoter DMPT was added thereto, followed by further stirring for 30 minutes. A mixed coating agent was coated on the Al plate and plywood with a thickness of 400 μm, and a 75 μm thick PET film was used. The coated Al plate and plywood were heated by hot air heating at 50 ° C. for 8 hours to cure the coating. The test results of this product are shown in Table 3 below.

division Pencil hardness Glossiness Defect Number Weather resistance Wear resistance Test Methods KS M 5000 KS A 0069 Visually KS R-0021 Canvas friction test Test 3H 92% 3 / 100cm2 2000 hours passed 3000 passes Control HB 75% Foreign object defect 10EA / 100㎠ 1600 hours discoloration 1500 possessions

For reference, the control was tested by mixing a curing agent in a 10: 1 weight ratio to the urethane paint by a spray method, spraying the Al plate on a spray plate at 80 ° C. for 1 hour, and drying it.

Example 4 Coating Method of UV Paint

A compound capable of forming radicals with a peroxide structure is used as a reaction initiator for polymerization reaction in PMMA and MMA coating compositions, and in particular, one of Dilauric Peroxide (DPO) or Benzoil Peroxide (BPO) is selected. It is prepared and used as a coating agent, but UV initiator is used as a coating agent by mixing a photoinitiator reacting to UV light, the viscosity is about 80 poise (POISE) using the PET film of the present invention as in the coating agent mixture composition as described above The coating was dropped after dropping the UV paint mixture on the object located between the PET film and the roller. At this time, UV treatment of 75 μm was performed for 3 minutes, and then hardened to 100 μm thickness. The test results of this product are shown in Table 4 below.

division Pencil hardness Glossiness Defect Number Weather resistance Wear resistance Test Methods KS M 5000 KS A 0069 Visually KS R-0021 Canvas friction test Test H 89% 0/100 / 100cm2 2000 hours passed 3000 passes Control HB 75% Foreign object defect 10EA / 100㎠ 1600 hours discoloration 1500 possession exposure

The above embodiments, test examples and drawings are merely for the purpose of describing the contents of the invention in detail, and are not intended to limit the scope of the technical idea of the invention, and the present invention described above is usually in the technical field to which the present invention belongs. As those skilled in the art, various substitutions, modifications and changes are possible within the scope without departing from the spirit of the present invention is not limited to the embodiments and the accompanying drawings, as well as the claims described below It should be determined that the claims are included in their equality.

According to the present invention according to the present invention according to the present invention, a coating composition is mixed to obtain a high gloss uniform coating film, and a reaction initiator mixture composition is prepared in the coating composition, and then the coating mixture is coated (coated product). The present invention relates to a high gloss coating method of dropping on a sheet) and simultaneously passing between a plastic film and a coating roller to coat the coating film, followed by hot air curing.

Since the high gloss coating method according to the present invention is used, high gloss coating is possible on various types of coating products, and the coating rate using the film can significantly reduce the defect rate caused by bubble generation, and a coating agent suitable for this coating method. By manufacturing the excellent weather resistance, and improve the durability by increasing the surface hardness, it can be applied to the production of high-gloss mobile phones, notebook computers, automotive interior materials, building materials and the like.

Claims (12)

delete In the coating method using a coating agent, A coating composition obtained by mixing polymethyl methacrylate (PMMA): methyl methacrylate (MMA) in a weight ratio of 1 to 9: 9 to 1 so as to have a viscosity of 50 to 250 poise in order to obtain a high gloss uniform coating film. Manufacturing step of; As a compound capable of radical formation of a peroxide structure in the coating composition, any one of dilauric peroxide (DPO) or benzoyl peroxide (Benzoil Peroxide (BPO) is selected and mixed as a reaction initiator. Preparing a coating mixture composition; A coating step of dropping the coating mixture composition on the product to be coated and simultaneously passing the film between the plastic film and the coating roller; And And a curing step of hot air curing after the coating treatment. The method of claim 2, wherein the coating composition is a high gloss coating method, characterized in that the UV paint. delete According to claim 2, Methyl ethyl ketone (MEK) 1-4: Xylen 1-4: Dilauric Peroxide organic solvent to facilitate the dissolution of the reaction initiator more easily , DPO) 1-2 by mixing in a weight ratio, high-gloss coating method, characterized in that for producing a reaction initiator mixture by heating in a bath at 40-80 ℃ The method according to claim 2, wherein, after preparation of the reaction initiator mixture, dimethyl-beta-propiothetin (DMPT) is added to 6-10 Kg wt% of the coating composition and 100-400 g wt% of the reaction initiator mixture. A further gloss coating method further comprising the step of preparing a promoter-added coating agent mixture composition by further adding 40 g% by weight of the accelerator and stirring. The high gloss coating method according to claim 2, wherein the curing step is performed by hot air treatment at 40 to 80 ° C., followed by curing by radical polymerization. The method of claim 2, wherein the coating treatment in the coating step is to drop the coating mixture composition on the product to be coated and to prevent the defect rate due to bubbles generated in the coating mixture composition, the plastic film and the coating roller (roller) High gloss coating method characterized in that to control the coating thickness at the roll height while passing through at the same time. 9. The high gloss coating method according to claim 2 or 8, wherein the coating thickness is 20 to 400 mu m. 8. The high gloss coating method according to claim 2 or 7, wherein the curing treatment in the curing step is performed by hot air heating at 50-60 ° C for about 5-7 hours to cure by polymerization. The high gloss coating method according to claim 2 or 8, wherein the film uses a polyethylene terephthalate (PET) film. A high gloss coating product manufactured by coating by the high gloss coating method of claim 2.

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