KR100653279B1 - Coating method of synthetic resin using urushi lacquer mixture - Google Patents

Abstract

A synthetic resin coating method using urushiol mixture is provided to mass-produce synthetic resin with various patterns and coated with urushiol fluid by applying the urushiol mixture on the synthetic resin by printing. The synthetic resin coating method using urushiol mixture comprises the steps of: pre-treating the surface of synthetic resin; offset-printing or silk-screen printing the synthetic resin; drying the printed synthetic resin; applying the mixture of urushiol fluid and varnish on the synthetic resin, wherein the mixture of urushiol fluid and varnish contains the urushiol fluid of 95~98wt.% and varnish of 2~5wt.%; and drying the synthetic resin coated with the urushiol varnish mixture. The synthetic resin is at least one selected from PET(Polyethylene Terephthalate), PP(Polypropylene), PS(Polystyrene), PVC(Polyvinyl Chloride), PVDC(Polyvinylidene Chloride), fluoro resin, acryl resin, polyacetic vinyl resin, polyamide resin, acetal resin, PC(Polycarbonate), polyphenylene oxide, polyester, polysulfone, and polyimide.

Description

Coating method of synthetic resin using lacquer mixed solution {COATING METHOD OF SYNTHETIC RESIN USING URUSHI LACQUER MIXTURE}

1 is a process chart for the coating method of the lacquer and varnish mixture of the synthetic resin according to the present invention.

Figure 2 is a view showing a cross-sectional view of the synthetic resin coated lacquer and varnish mixture prepared by the method of the present invention.

Figure 3 is a photograph of a polyethylene terphthalate (PET) resin to which the lacquer and varnish mixed liquid prepared by the method of the present invention is applied.

Figure 4 is a process chart for the coating method of the lacquer and lacquer mixture of the synthetic resin according to the present invention.

Figure 5 is a view showing a cross-sectional view of the synthetic resin is applied lacquer and lacquer mixture prepared by the method of the present invention.

6 is a photograph of a polycarbonate (PC) resin coated with a lacquer and lacquer mixture prepared by the method of the present invention.

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, there is no disclosure about the use of a lacquer that is vividly coated while maintaining various printed patterns, and the lacquer coating causes an allergic reaction to the human body before it is cured, thereby avoiding its use by general users. There was a lot of inconvenience. 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 provide a coating method of a synthetic resin using a lacquer and varnish mixture for industrially mass production of a synthetic resin having a variety of colors using a printing method can be lacquer coating, excellent in far-line radiation and electromagnetic wave blocking effect It is.

Still another object of the present invention is to provide a coating method of a synthetic resin using lacquer and lacquer mixture liquid for industrially mass production of synthetic resin having various luster and color and excellent hardness using a printing method.

Coating method of the synthetic resin using the lacquer mixed solution according to the present invention for achieving the above technical problem, the pre-treatment step, the printing process by offset printing or silk-screen printing on the surface of the synthetic resin, the drying process of the printed synthetic resin, filtered The present invention relates to a coating method of a synthetic resin using a lacquer mixture comprising a coating step of applying to the synthetic resin using a lacquer and varnish mixture 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.

The printing process by offset printing or silkscreen printing on the pretreated synthetic resin is to print the ink that can express various colors and designs on the synthetic resin in advance, and 60 to 160 for 30 to 90 minutes immediately after the printing process. A drying process drying at < RTI ID = 0.0 >

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.

As shown in Figure 2, the synthetic resin produced by the above method, from the bottom of the synthetic resin 10, primer coating layer 20, design printing layer 30, lacquer coating layer 40, lacquer coating layer 50 In order.

In addition, the present invention provides a coating method of the synthetic resin using a lacquer and lacquer mixture, the pre-treatment process on the surface of the synthetic resin, the printing process by offset printing or silk-screen printing, the drying process of the printed synthetic resin, filtered lacquer And it provides a coating method of the synthetic resin using the lacquer and lacquer mixture liquid comprising a coating step of applying to the synthetic resin using a lacquer mixture and 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 offset printing or silk-screen printing 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.

As shown in FIG. 5, the synthetic resin prepared by the above method is in order from the bottom to the synthetic resin 10, the primer coating layer 20, the design printing layer 30, the lacquer and lacquer mixed liquid coating layer 40 ′. Consists of.

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

Example 1. Coating of Synthetic Resin Using Lacquer

1 is a process chart for the coating method of the synthetic resin according to the present invention, specifically, in the present invention 0.1 mm thick 0.25 ~ 0.30kg polyethylene terphthalate resin (Saehan PET Co.) and surface cleaning and washing with water and degreasing agent Next, a primer (PRIMER) (Chromtrik, CROMTRYCK Sweden) was applied to the polyethylene terphthalate resin thinly at about 100 to 200 g / m, and left to stand for 20 to 30 minutes for pretreatment.

Subsequently, the ink in which the pattern designed through offset printing is expressed is printed on the polyethylene terphthalate resin, and then dried at 140 ° C. for 1 hour 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 (see Figure 3).

Example 3 Coating of Synthetic Resin Using Lacquer and Lacquer Mixture

Figure 4 is a process chart for the coating method of the synthetic resin according to the present invention, specifically, in the present invention, the surface of the polycarbonate (PC, Co., Ltd.) of 1 mm thickness and surface cleaning and washing with a degreasing agent, A primer (Chromtrik, CROMTRYCK Sweden) was applied to the polycarbonate thinly at about 100 to 200 g / m, and left to stand for 20 to 30 minutes for pretreatment.

Subsequently, the ink in which the pattern is designed through offset printing is printed on the polycarbonate resin, and then dried at 160 ° C. for 1 hour in a box oven (solar electricity).

After filtering the raw lacquer with a 300 mesh filter paper, and preparing a lacquer liquid mixed with 5% by weight of varnish to the total weight of the filtered lacquer, the lacquer and PMMA and MMA (plex6788, ROHM Co., Ltd.) is mixed with 6: 4 The mixed solution was prepared by varying the weight ratio as shown in Table 1 below, and then applied to the printed polycarbonate resin by a silk screen to a thickness of 1.5 to 2.5 μm, and dried at 160 ° C. for 1 hour in a box oven machine to mix lacquer To prepare a polycarbonate resin coated (see Figure 5).

Example 3 Lacquer liquid (wt%) Lacca mixture (wt%) 3-1 10 90 3-2 30 70 3-3 50 50 3-4 70 30 3-5 80 20

As a result, as can be seen in Figure 5, as the content of the lacquer solution was increased the color became darker (A: 10% by weight lacquer + 90% by weight of lacquer mixture, B: 30% by weight of lacquer solution + 70% by weight of lacquer mixture %).

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 The electromagnetic wave absorption rate at was performed by requesting the Hyundai calibration certification institute according to the conditions of Table 3 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) 0.108

As a result, as shown in Table 4, all three exhibited an electromagnetic wave absorption rate of 1.6 W / kg or less, which is an electromagnetic wave exposure standard, but the case of a mobile phone case manufactured using the polyethylene terphthalate resin produced by the method of the present invention. It was confirmed that it showed the best electromagnetic wave absorption rate of 0.108.

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 a 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 5 below.

Emissivity (5 ~ 20㎛) Radiation energy (W / ㎡ · ㎛, 37 ℃) 0.85 3.22 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 6, it was confirmed that the excellent antimicrobial activity in the lacquer-coated synthetic resin according to the present invention.

The above-described examples, 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. 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 according to the present invention uses a printing method, the lacquer mixed solution of the present invention is applied to the synthetic resin printed with an ink expressed in various colors and patterns by a printing method, having a variety of patterns Lacquer-coated synthetic resin can be easily produced in large scale on an industrial scale, and has excellent absorption of harmful electromagnetic wave, far-infrared emissivity, antibacterial and durability, so it can be applied to various materials such as mobile phones, notebook computers, automobile interior materials, construction materials, etc. have.

Claims (9)

Pretreatment of the surface of the synthetic resin; Printing process by offset printing or silkscreen printing; Drying of the printed synthetic resin; An application step of applying to the synthetic resin using a mixed solution of filtered lacquer and varnish containing 95 to 98% by weight and varnish 2 to 5% by weight relative to the total weight of the mixed solution; And Method of coating a synthetic resin using a mixed solution of the lacquer comprising the drying step of the applied 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), polyphenylene oxide, polyester, polysulfone or polyimide coating of synthetic resin using a lacquer mixture, characterized in that at least one selected from polyimide Way. delete The method according to claim 1 or 2, Lacquer synthetic resin using a lacquer mixture, characterized in that further comprising the step of applying a lacquer (lacquer) containing a polymethyl methacrylate (PMMA) and methyl methacrylate (MMA) to the lacquered synthetic resin and a drying step of the synthetic resin coated with the lacquer Coating method. The method of claim 4, wherein The lacquer is a coating method of synthetic resin using a lacquer mixture, characterized in that PMMA: MMA is 5 to 8: 5 to 2. Pretreatment of the surface of the synthetic resin; Printing process by offset printing or silkscreen printing; Drying of the printed synthetic resin; An application step of applying to the synthetic resin using a mixed solution of filtered lacquer and varnish containing 5 to 90% by weight of lacquer and 95 to 10% by weight of lacquer relative to the total weight of the mixture; And Method of coating a synthetic resin using a mixed solution of the lacquer comprising the drying step of the applied 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), polyphenylene oxide, polyester, polysulfone or polyimide coating of synthetic resin using a lacquer mixture, characterized in that at least one selected from polyimide Way. delete The method according to claim 6 or 7, The lacquer contains PMMA and MMA, PMMA: MMA coating method of the synthetic resin using a lacquer and mixed liquid, characterized in that 5 to 8: 5 to 2.

Images