KR20070006005A - Coating method of synthetic resin using silk screen printing of mixture of ink and urushi lacquer - Google Patents

Abstract

A synthetic resin coating method using silk screen printing of the mixture of ink and urushi lacquer is provided to produce synthetic resin printed with various patterns and coated with urushi lacquer by applying the mixture of ink and urushi lacquer by silk screen printing and to secure good electron wave absorptivity, far infrared ray emission rate, and durability by adding the urushi lacquer. The synthetic resin coating method using silk screen printing of the mixture of ink and urushi lacquer comprises the steps of: pre-treating the surface of synthetic resin; printing the synthetic resin with the mixture containing the ink of 5~95wt.% and urushi lacquer of 95~5wt.% by silk screen printing; applying the mixture of the filtered urushi lacquer and varnish, on the synthetic resin; and drying the lacquered synthetic resin.

Description

COATING METHOD OF SYNTHETIC RESIN USING SILK SCREEN PRINTING OF MIXTURE OF INK AND URUSHI LACQUER}

1 is a process chart of an embodiment of a coating method of a synthetic resin using silk screen printing of the ink and lacquer mixture according to the present invention.

Figure 2 is a view showing a cross-sectional view of the synthetic resin using silk screen printing of the ink and lacquer mixed solution prepared by one embodiment according to the present invention.

FIG. 3 is a photograph of a polyethylene terphthalate (PET) resin coated with a lacquer and varnish mixture after a silkscreen printing process of 50% by weight of ink and 50% by weight of a lacquer mixture.

Figure 4 is a flow chart of another embodiment of the coating method of the synthetic resin using the silk-screen printing of the ink and lacquer mixture according to the present invention.

Figure 5 is a view showing a cross-sectional view of the synthetic resin using silk screen printing of the ink and lacquer mixed solution prepared by another embodiment according to the present invention.

6 is a photograph of a polyethylene terphthalate (PET) resin coated with a lacquer and a lacquer mixture after a silkscreen printing process of 50% by weight of ink and 50% by weight of a lacquer mixture.

The present invention relates to a method for coating a synthetic resin using silk screen printing of ink and lacquer mixtures, and more particularly, to a pretreatment process for the surface of a synthetic resin, a printing process by silkscreen printing of an ink and lacquer mixture, and a printed synthetic resin. It relates to a coating method of a synthetic resin using silk-screen printing of the ink and lacquer mixture, comprising a drying step, a coating step of applying to the synthetic resin using a filtered lacquer mixture and a drying step of the applied synthetic resin.

It is known that raw lacquer or lacquer liquid collected from lacquer trees contains urushiol as its main ingredient, and also contains a small amount of rubber, nitrogenous substances, and moisture. Lacquer is a kind of natural resin that has been used in thousands of years in Korea, China and Japan, mainly applied to wooden products, and has been used in large quantities in the production of daily necessities such as cabinets, bowls, cutlery, and tableware. It is a well-known fact that it has the advantage of excellent insect repellency and insulation, and especially excellent storage.

Recently, efforts have been made to use not only wood products but also various applications such as synthetic polymers (Korean Patent Laid-Open Publication No. 2000-0024493), ceramics and metal containers (Korean Patent Publication No. 2002-0072903) using lacquer. .

However, the use of a lacquer that is vividly coated while maintaining various printed patterns is not disclosed, and the lacquer coating causes an allergic reaction to the human body before it is cured, thereby avoiding the use by the general users. There were many inconveniences in use. The hardening of the lacquer coating is produced from the surface where water and oxygen are most in contact, and since the oxygen and moisture permeability of the lacquer coating are very low, UV curing is used to harden the lacquer into the coating or by hand It was cumbersome to repeat many times of hardening, and it was difficult for industrial mass production due to the inconsistency that the unit cost increased.

The present invention has been made to solve the problems of the prior art,

An object of the present invention is to print a synthetic resin in a variety of colors by using a silk-screen printing method of the ink and lacquer liquid mixture, and then silk-screen printing with a liquid mixture and lacquer and varnish liquid industrially synthetic resin excellent in far-infrared radiation, electromagnetic wave blocking effect and antibacterial effect It is to provide a coating method of a synthetic resin using silk screen printing of a mixture of ink and lacquer liquid for mass production.

Another object of the present invention is to print a synthetic resin in a variety of colors by using a silk-screen printing method of the ink and lacquer liquid mixture, and then silk-screen printing with a mixture of lacquer and lacquer liquid has a variety of gloss and colors, excellent hardness It is to provide a coating method of synthetic resin using silk screen printing of ink and lacquer mixture for industrial mass production.

The coating method of the synthetic resin using the silk-screen printing of the ink and lacquer mixed solution according to the present invention for achieving the above technical problem, the pre-treatment step for the surface of the synthetic resin, the printing process by the silk-screen printing of the ink and lacquer mixed solution, printing It relates to a method of coating a synthetic resin using a mixed solution of a lacquer liquid comprising a drying step of the synthetic resin, a coating step of applying to the synthetic resin using a filtered lacquer and varnish mixture liquid and a drying step of the applied synthetic resin. At this time, it is preferable to further include a lacquer coating process containing PMMA (polymethyl methacrylate) and MMA (methyl methacrylate) to the lacquered coated synthetic resin and the drying process of the synthetic resin coated with the lacquer .

Hereinafter, the present invention will be described in more detail.

The synthetic resin applied to the present invention includes polyethylene terphthalate (PET), polypropylene (PP), polystyrene (PS), polyvinyl chloride (PVC), polyvinylidene chloride (PVDC) , Synthetic resins such as fluororesin, acrylic resin, polyvinyl acetate resin, polyamide resin, acetal resin, polycarbonate (PC), polyphenylene oxide, polyester, polysulfone, polyimide, etc. Preference is given to phthalates. The synthetic resin has a thickness of 0.01 ~ 7 mm washed by the surface. Since the synthetic resins have a lot of dust because static electricity is generated as a whole, it is usual to print while removing dust at the time of a printing operation. In order to solve this problem, the latest equipment is equipped with an antistatic treatment, and there is a method of using an antistatic agent.

The pretreatment process may be classified into physical methods, chemical methods, and primers. Physical methods include sand blast, short blast, dry ice blast, hairline, and vibration. Chemical methods include electrolytic coloring and alkaline degreasing for the final wash in all tests.

 Primer treatment is used when it is impossible to bond with inorganic paints such as plastic, and is used for silk screen printing for the purpose of hot air and various decorations and labels. The above pretreatment step is to increase the adhesive force at the time of printing, and to increase the corrosion resistance. In the present invention, it is preferable to perform a primer treatment after washing and degreasing to increase the adhesive force.

Silk screen printing of the ink and lacquer mixed solution on the pre-treated synthetic resin, silk screen printing on the synthetic resin by mixing 5 to 95% by weight of the ink, which can express various colors and designs, with 95 to 5% by weight of the filtered lacquer By printing in a manner, a drying step of drying at 60 ~ 160 ℃ for 30 minutes to 90 minutes immediately after the printing process is performed. At this time, there is no particular limitation on the type of silk screen ink used.

The lacquer coating step on the synthetic resin, which has undergone the printing process and the drying process, is a process of preparing a lacquer and varnish mixture and then applying the same to the synthetic resin.

The lacquer used in the present invention is not subject to the origin of Korea, China, Japan, Southeast Asia, etc., and these lacquer liquids may show some differences in composition depending on the origin, but all can be applied. Lacquer liquid used in the present invention is used after filtration with a filter paper to remove impurities, to prepare a mixed liquid containing 95 to 98% by weight of the filtered lacquer liquid and varnish 2 to 5% by weight. The prepared lacquer and varnish mixture is not limited thereto, but is preferably applied by silk screen printing. Immediately after the application of the lacquer and varnish mixture, a drying process is performed at 60 to 160 ° C. for 30 to 90 minutes.

At this time, in order to increase the glossiness and to enhance weather resistance, the coating process of lacquer containing PMMA (polymethyl methacrylate) and MMA (methyl methacrylate) to the lacquered synthetic resin after the drying process and of the synthetic resin coated with the lacquer It is preferable to further include a drying process.

PMMA is an acrylic resin containing MMA monomer as a main raw material, and in the present invention, the mixture containing PMMA and MMA is 95 to 99% by weight based on the total weight of lacquer, and the addition ratio of PMMA and MMA is 5 to 8 : It is preferable that it is 5: 2, and it is most preferable that PMMA: MMA is 6: 4 excellent in transparency and a physical property.

The lacquer mixture is not limited thereto, but is preferably applied by silk screen printing. Immediately after application of the lacquer mixture, a drying process is performed at 60 to 160 ° C. for 30 to 90 minutes. Drying of the synthetic resin printed in each step is carried out on a flat metal plate, the drying temperature is the optimum temperature conditions for removing the cracks, peeling, etc. of the coating layer during the lacquer curing and increase the adhesion.

Synthetic resin prepared by the above method, as shown in Figure 2, from the bottom of the synthetic resin 10, primer coating layer 20, the design printing layer 30 of the ink and lacquer liquid mixture, lacquer coating layer 40, lacquer The coating layer 50 is formed in order.

In addition, the present invention is a pre-treatment step for the surface of the synthetic resin, a printing step by the silk-screen printing of the ink and lacquer mixed solution, the drying step of the printed synthetic resin, the coating step of applying to the synthetic resin using the filtered lacquer and lacquer mixed solution And it provides a coating method of the synthetic resin using the silk-screen printing of the ink and lacquer mixed solution comprising a drying step of the applied synthetic resin.

At this time, the pretreatment process for the surface of the synthetic resin, the printing process by the silk-screen printing of the ink and lacquer liquid mixture and the drying process of the printed synthetic resin goes through the same process as described above.

Performing a coating step of applying the lacquer and lacquer mixture to the synthetic resin after the printing process and drying process. At this time, the lacquer liquid to be used is filtered through a filter paper, to prepare a mixed liquid containing 5 to 90% by weight of the filtered lacquer liquid and 95 to 10% by weight lacquer mixture. The higher the lacquer content and the lower the lacca content, the lower the gloss of the surface and the darker the color. However, the lower the lacquer content and the higher the lacquer content, the higher the gloss and the brighter the color. Therefore, it is possible to coat with a variety of gloss and colors to suit consumer preferences.

At this time, it is preferable to mix the varnish 5% by weight with respect to the lacquer. The prepared lacquer and lacquer mixed solution is not limited thereto, but is preferably applied by silk screen printing.

At this time, in the present invention, the lacquer mixture containing PMMA and MMA is 20 to 80% by weight based on the total weight of the mixture to be applied, PMMA: MMA is preferably mixed in a ratio of 5 to 8: 5 to 2, PMMA: It is most preferable that MMA is 6: 4 because it is excellent in transparency and a physical property.

Immediately after the application of the lacquer and lacquer mixture, a drying process is performed at 60 to 160 ° C. for 30 to 90 minutes. Drying of the synthetic resin printed in each step is carried out on a flat metal plate, the drying temperature is the optimum temperature conditions for removing the cracks, peeling, etc. of the coating layer during the lacquer curing and increase the adhesion.

The synthetic resin produced by the above method, as shown in Figure 5, the synthetic resin 10, primer coating layer 20, the design printing layer 30 of the ink and lacquer mixed solution from the bottom, lacquer and lacquer mixed coating layer 40 ') In order.

Hereinafter, the configuration of the present invention will be described in detail through examples and test examples. However, the scope of the present invention is not limited to the claims of the present invention by the following examples and test examples.

Example 1. Coating of Synthetic Resin Using Lacquer

1 is a process chart of an embodiment of the coating method of the synthetic resin using the silk-screen printing of the ink and lacquer mixed solution according to the present invention, specifically, in the present invention, polyethylene terphthalate resin of 0.1 mm 0.25 ~ 0.30kg (Sanew PET Co., Ltd.). Surface cleaning) and surface cleaning with water washing and degreasing agent, and then pre-treated by applying a primer (PRRIMER) (Chromtrik, CROMTRYCK Sweden) thinly to 100 ~ 200g / m to the polyethylene terphthalate resin and left for 20 to 30 minutes It was.

After the silk screen printing, the polyethylene terphthalate resin is mixed with 50% by weight of black ink for MDS (MDS) and 50% by weight of lacquer, and 50% by weight of blue ink for PET (MDS) and 50% by weight of lacquer. After printing on each, and dried for 1 hour at 140 ℃ in a box oven (solar electricity).

After filtering the Chinese fresh lacquer with 300 mesh filter paper, and preparing a mixed solution of 5% by weight of varnish to the total weight of the filtered lacquer, the mixed solution is 1.5 ~ 2.5㎛ by the silkscreen on the printed polyethylene terphthalate resin After coating to a thickness, it was dried for 1 hour at 140 ℃ in a box oven.

Example 2. Application of lacquer after coating of synthetic resin using lacquer

Lacca (plex6788, ROHM) comprising a mixed solution of PMMA and MMA 6: 4 to the lacquer-coated polyethylene terephthalate resin after the process of Example 1 After coating by silk screen, and dried in a box oven for 1 hour 100 ℃ to prepare a lacquer coated polyethylene terephthalate resin (A and B of Figure 3).

Example 3 Coating of Synthetic Resin Using Lacquer and Lacquer Mixture

Figure 4 is a process diagram of another embodiment of the coating method of the synthetic resin using the silk-screen printing of the ink and lacquer liquid mixture according to the present invention, specifically, in the present invention, polyethylene terphthalate resin of 0.1 mm 0.25 ~ 0.30kg (new PET) G) surface cleansing and surface cleaning with water washing and degreasing agent, and then pre-treated by applying a thin primer (chromic, CROMTRYCK Sweden) 100 ~ 200g / m to the polyethylene terphthalate resin and left for 20 to 30 minutes.

Then, silkscreen printing 50% by weight of red ink (MDS) and 50% by weight of lacquer, 50% by weight of silver ink (MDS) and 50% by weight of lacquer, PET white ink ( MDS) 50% by weight and 50% by weight of lacquer, 50% by weight of yellow ink for PET (MDS) and 50% by weight of lacquer, respectively, were printed on the polyethylene terphthalate resin, and then box oven Dried at 140 ° C. for 1 hour.

After filtering the raw lacquer with 300 mesh filter paper, and preparing a lacquer liquid mixed with 5% by weight of varnish based on the total weight of the filtered lacquer, 10% by weight of the lacquer solution and PMMA and MMA (plex6788, ROHM) were 6: 4. 90 wt% of the mixed lacquer mixture was prepared, and then applied to the printed polyethylene terphthalate resin by a silkscreen to a thickness of 1.5 to 2.5 μm, and dried in a box oven for 1 hour to be coated with a lacquer mixture. Polyethylene terphthalate resin was prepared (see A, B, C and D of FIG. 6).

Test Example 1 Electromagnetic Absorption Rate Test

The inventors of the present invention by using a polyethylene terphthalate resin prepared in Example 2 by bonding by heat fusion commonly used for bonding of synthetic resins to produce a cell phone case, then the cell phone case of A and B companies in the market And the electromagnetic wave absorption rate was performed by the Hyundai Institute of Calibration Certification Co., Ltd. in accordance with the conditions of Table 1 below.

Test environment Electrical Characteristics of Medium Condition of EUT Test site temperature 21.4 ℃ Relative dielectric constant 40.22 Test signal PCS Relative humidity 54% conductivity 1.352 S m ^-1 Conduction power Max. Power density 1.3 kg m ^-3 EUT Operation State Maximum transmission status in CALL MODE

frequency Output (dBm) Exam conditions Test location Electromagnetic Absorption Rate (W / ㎏) MHz channel 1751.25 25 23.0 dBm A company case Contact position (left) 0.760 Company B case Contact position (left) 0.849 Example 2 Case Contact position (left) 0.098

As a result, as shown in Table 2, all three exhibited an electromagnetic wave absorption rate of 1.6 W / kg or less, which is an electromagnetic wave exposure standard, but in the case of a mobile phone case manufactured using a polyethylene terphthalate resin produced by the method of the present invention. It was confirmed that it showed the best electromagnetic wave absorption rate of 0.098.

Test Example 2. Far Infrared Radiation Effect Test

The present inventors performed the far-infrared emissivity emitted from the polyethylene terphthalate resin prepared in Example 2 by requesting the Korea Institute of Far Infrared Application Evaluation (KIFA).

Specifically, as a result of measuring the black body using the FT-IR spectrometer at 37 ℃ compared to the black body (black body) it was confirmed that the excellent far-infrared emissivity as shown in Table 3 below.

Emissivity (5 ~ 20㎛) Radiation energy (W / ㎡ · ㎛, 37 ℃) 0.88 3.45 x 10 ²

Test Example 3 Antibacterial Effect Test

The present inventors performed the antimicrobial test on the polyethylene terphthalate resin prepared in Example 2 by the Korea Research Institute for Chemical Testing. The test strains used were Escherichia coli ATCC 8739 and Staphylococcus aureus ATCC 6538.

Test Items sample Result Test Methods E. coli A 3.6 x 10 ⁵ CFU / Sample ZIS Z 2801: 2000 B 1.3 x 10 ⁷ CFU / Sample C <10 CFU / sample Antimicrobial activity 6.1 or later S. aureus A 2.0 x 10 ⁵ CFU / Sample ZIS Z 2801: 2000 B 3.3 x 10 ⁵ CFU / Sample C <10 CFU / sample Antimicrobial activity 4.5 or more

At this time, A is the initial number of bacteria (average value) of the control specimen, B is the strain (average value) of the control specimen after 24 hours culture, C is the number of bacteria (average value) in the polyethylene terphthalate resin prepared according to the present invention after 24 hours culture ), And the antimicrobial activity value (log (B / C)) is the log (B / A) minus log (C / A).

As shown in Table 4, it was confirmed that the excellent antimicrobial activity in the lacquer-coated synthetic resin according to the present invention.

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.

Since the coating method of the synthetic resin according to the present invention is applied to the ink and lacquer liquid mixture represented by various colors and patterns by the silk screen printing method, the synthetic resin coated with lacquer liquid having various patterns can be easily mass-produced on an industrial scale. Since the lacquer component is excellent in absorbing harmful electromagnetic waves, far-infrared emissivity, antibacterial and durability, it can be applied to various materials such as mobile phones, notebook computers, automobile interior materials, building materials.

Claims (9)

Pretreatment process on the surface of synthetic resin, printing process by silkscreen printing of 5 ~ 95% by weight ink and 95 ~ 5% by weight lacquer mixture, drying process of printed synthetic resin, mixed solution of filtered lacquer and varnish A method of coating a synthetic resin using a silk screen printing of the ink and lacquer mixed solution comprising a lacquer step and a lacquered synthetic resin drying step of applying to the synthetic resin. The method of claim 1, The synthetic resin, Polyethylene terphthalate (PET), polypropylene (PP), polystyrene (PS), polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), fluororesin, acrylic resin , Polyvinyl acetate resin, polyamide resin, acetal resin, polycarbonate (polycarbonate; PC), at least one selected from polyphenylene oxide, polyester, polysulfone or polyimide silk screen of the ink and lacquer liquid mixture Coating method of synthetic resin using printing. The method of claim 2, The mixed solution of the lacquer and varnish, A method of coating a synthetic resin using silk-screen printing of the ink and lacquer mixture, characterized in that it comprises 95 to 98% by weight and varnish 2 to 5% by weight relative to the total weight of the mixture. The method according to any one of claims 1 to 3, Ink and characterized in that further comprising the step of applying a lacquer (lacquer) containing PMMA (polymethyl methacrylate) and MMA (methyl methacrylate) to the synthetic resin dried after the lacquer step and the drying step of the synthetic resin coated with the lacquer Coating method of synthetic resin using silk screen printing of lacquer mixture. The method of claim 4, wherein The lacquer is a coating method of synthetic resin using silk screen printing of ink and lacquer mixture, characterized in that PMMA: MMA is 5 to 8: 5 to 2. By using a pretreatment process on the surface of the synthetic resin, silk-screen printing of 5 to 95% by weight of ink and 95 to 5% by weight of the lacquer mixture, drying process of the printed synthetic resin, filtered lacquer and lacquer mixture A method of coating a synthetic resin using silk screen printing of an ink and lacquer mixture comprising a coating step applied to a synthetic resin and a drying step of the coated synthetic resin. The method of claim 6, The synthetic resin, Polyethylene terphthalate (PET), polypropylene (PP), polystyrene (PS), polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), fluororesin, acrylic resin , Polyvinyl acetate resin, polyamide resin, acetal resin, polycarbonate (polycarbonate; PC), at least one selected from polyphenylene oxide, polyester, polysulfone or polyimide silk screen of the ink and lacquer liquid mixture Coating method of synthetic resin using printing. The method of claim 7, wherein The lacquer and lacquer mixture liquid, A method of coating synthetic resin using silk screen printing of an ink and lacquer mixture, comprising 5 to 90 wt% of lacquer and 95 to 10 wt% of lacquer relative to the total weight of the mixture. The method according to any one of claims 6 to 8, The lacquer containing PMMA and MMA, PMMA: MMA is a coating method of synthetic resin using silk screen printing of ink and lacquer liquid mixture, characterized in that 5 to 8: 5 to 2.

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