KR100694419B1 - Method for high grossy painting using color primer mixture - Google Patents

Abstract

A high gloss painting method using color primer is provided to shorten the process time by 120 minutes, to improve the yield rate by 11.5%, and to decrease the cross-cutting defective rate by improving painting strength characteristic. The high gloss painting method using color primer comprises the steps of: forming a primer layer(210) on the surface of a material; forming a color primer layer(220) by using a color primer mixture produced by mixing resin, an additive, and a pigment at the predetermined ratio; and forming a clear layer(230) for securing high gloss, on the color primer layer. A value obtained by a strength test by changing the mixing ratio of components forming the color primer mixture is applied to the mixing ratio of the resin, the additive, and the pigment.

Description

Method for high grossy painting using color primer mixture

1 is a flow chart for explaining a high gloss coating method according to a conventional method

2 is a view showing a cross-sectional view of a coating layer formed according to a high gloss coating method using a color primer according to the present invention.

3 is a flowchart illustrating a high gloss coating method using a color primer according to the present invention.

Figures 4a to 4c is a view showing the coating strength measurement results according to the drying temperature and time in the coating process, the mixing ratio of the resin and the additive and pigment constituting the color primer mixture

5 is a view showing the coating strength according to the mixing ratio of the resin, the additive and the pigment constituting the color primer mixture

6 is a view showing the coating strength according to the mixing ratio of each component of the color primer mixture

<Description of Symbols for Major Components of Drawings>

200: case material 210: primer layer

220: color layer 230: clear layer

The present invention relates to a high gloss coating method using a color primer.

In general, materials used for electronics cases, such as home appliances such as refrigerators and washing machines, and telecommunications products such as mobile phones, laptop computers, and desktop computers, may be applied to surfaces for improved aesthetic appearance and protection from external shocks. The coating is performed, and the pigment is mixed and used during the painting process so as to display a suitable color for the desired color.

1 is a flowchart illustrating a high gloss coating method according to a conventional method.

Referring to Figure 1, in the high gloss coating method according to the conventional method, forming a primer layer of two layers on the material (S110), and forming a color layer on the primer layer (S120), Coating is performed by forming a clear layer for high gloss on the color layer (S130) and polishing the formed coating layer (S140).

In more detail, first, for high gloss coating on the surface of the material, a base primer (Primer) layer is applied to the magnesium (Mg) material to improve adhesion and to prevent corrosion (S111), and then dry it (S112).

Thereafter, after the base primer layer is dried, surface processing is performed to remove foreign substances, etc. remaining on the primer layer (S113).

After re-coating another primer layer on the primer layer in which foreign matters are removed according to the above process (S114), the drying process is repeated again (S115).

Then, after applying a color layer containing a pigment to implement the appearance color (S121) and dried (S122).

As a further appearance work for forming aesthetics on the appearance of the material surface on the dried color layer surface, a pearl clear layer is applied (S131) and then dried (S132).

After the drying process is further coated with a clear layer for improving the surface gloss (Glossy) (S133) and then dried (S134).

Thereafter, by performing a polishing process (S140), the coating process as an appearance work on the surface of the material is finished.

In the case of the product case coating process according to the prior art carried out as described above, in each coating layer forming step, as each of the material coating process for forming the coating layer and the drying process for drying the applied material is performed, the coating process As a whole, there is a problem in that the time required for painting becomes long, and the stability between coating layers decreases due to the formation and drying process of the coating film material several times, thereby lowering the overall strength of the coating layer.

It is an object of the present invention to provide a high gloss coating method using color primers that can improve process yield and reduce cost and product productivity.

In addition, an object of the present invention is to provide a high gloss coating method using a color primer that can reduce the cross-cut defect rate to improve cost reduction and product productivity.

The high gloss coating method using the color primer according to the present invention for achieving the above object, by forming a primer layer on the surface of the material, using a color primer mixture of a resin, an additive and a pigment in a predetermined ratio Forming a color primer layer, and forming a clear layer for high gloss on the color primer mixture layer.

The predetermined ratio in which the resin, the additive, and the pigment are mixed is characterized in that a value obtained by a strength test in which the mixing ratio of each component constituting the color primer mixture is applied is applied.

The color primer mixture is characterized in that the mixing ratio of resin: additive: pigment = 46: 12: 40.

The pigment is characterized in that the pigment of achromatic color system.

Before the step of forming the clear layer, after the step of forming the color primer layer is characterized in that the step of applying a pearl clear layer further.

According to the present invention constituted as described above, by applying a color primer mixture mixed with a resin and an additive and a pigment in a predetermined ratio to form a color primer mixture layer, after applying the primer, after the drying process, the exterior color treatment Compared to the conventional method of forming a color layer for the cross-cutting defect rate can be significantly lowered, while reducing the number of painting process can be improved the yield in the painting process.

Hereinafter, with reference to the accompanying drawings will be described in detail a high gloss coating method using a color primer according to the present invention.

In order to reduce the number of painting processes in the coating method according to the prior art, the coating process is first performed by mixing and applying the materials of a clear layer and a pearl clear layer which are formed separately in the conventional painting process. Was tested. However, in this case, since the clear layer material is small in size, it does not satisfy the required specification as appearance defects occur due to the chipping after the last polishing process.

On the other hand, even when the paint test was performed by mixing materials of the Pearl Clear layer and the Color layer, the specification required for the exterior design could not be satisfied. This was the result of the pearl clear layer constituent particles buried in the color layer material. Moreover, in the case of achromatic color, only brightness is present, which results in a deviation from the required specification.

Finally, the coating test was performed using the color primer mixture in which the materials of the primer layer and the color layer were mixed, and the results satisfying the color required by the design were obtained. This is possible by experimenting with mixtures to derive the optimum blending ratio of the color primer mixture components and using the mixed color primer mixture according to the derived blending ratio.

Hereinafter, the coating method using the color primer according to the present invention performed using the color primer mixture in which the primer layer and the color layer material are mixed will be described in detail.

2 is a cross-sectional view of a coating layer formed according to a high gloss coating method using a color primer according to the present invention, and FIG. 3 is a flowchart illustrating a high gloss coating method using a color primer according to the present invention.

In the high gloss coating method using the color primer according to the present invention, referring to FIGS. 2 and 3, a step (S310) of forming the primer layer 210 on the material 200, and a resin, an additive, and a pigment are prescribed. Forming a mixed color primer layer 220 at a ratio (S320), forming a clear layer 230 for high gloss on the color primer layer 220 (S330), and polishing the formed coating layer. It is achieved by performing (S340).

Each of these steps will be described in more detail.

First, the primer layer 210 is coated on the case material 200 to improve adhesion of the coating layer to the material and to prevent corrosion of the material (S311). The primer layer 210 is preferably formed to a thickness of about 20㎛.

Thereafter, the coated primer layer 210 is dried at a temperature of about 75 ° C. for about 30 minutes (S312), and surface treatment is performed to remove foreign substances on the surface of the primer layer (S313).

When the foreign material on the surface of the primer layer 210 is removed according to the above process, the color primer layer 220 is formed by applying a color primer mixture obtained by mixing a resin, an additive, and a pigment in a predetermined ratio to realize color on the material surface. (S321). The color primer layer 320 is also preferably formed to a thickness of about 20㎛ average.

Then, the applied color primer layer 220 is dried for about 30 minutes at a temperature condition of about 75 ℃ (S322).

According to the conventional method, another primer layer is further applied on the surface-treated base primer layer, and then a color layer containing pigment is applied, whereas in the present invention, a resin layer is applied on the primer layer 210. The color primer layer 220 is formed in a single process by applying a color primer mixture in which the additive and the pigment are mixed in a predetermined ratio.

As such, when the resin layer, the additive layer, and the pigment layer are simultaneously formed using a mixture of resins, additives, and pigments in a predetermined ratio, the color and paint strength required for the exterior design of the material may be satisfied. The mixing ratio of the resin, the additive and the pigment constituting the color primer mixture and the process conditions during application and drying should be maintained optimally. This will be described later.

After the drying process (S322), an additional appearance work for imparting visual characteristics and gloss on the surface of the dried color primer layer 220 is performed (S320).

To this end, in order to add a layer of glittering powder particles, a pearl clear layer is applied (S331). The pearl clear layer may be omitted as necessary. In the case of forming the pearl clear layer, it is preferable to form a thickness of about 20 μm. In this case, the coated pearl clear layer is dried for about 30 minutes at a temperature condition of about 75 ℃ (S332).

After the drying process (S332), to apply a clear layer 230 to improve the surface gloss (Glossy) (S333). The clear layer 230 is preferably formed to a thickness of about 50㎛. Thereafter, the coated clear layer 230 is dried for about 60 minutes at a temperature condition of about 75 ℃ (S334).

In the case where the silver coating is performed, the gloss index is 20 to 25, whereas the clear layer 230 forms high glossiness of 100 or more.

After the clear layer 230 is formed, a polishing process S340 is performed to finish the painting process as an external appearance of the material surface.

In the high gloss coating method using the color primer according to the present invention carried out as described above, the primer layer material and the color layer material should be mixed at an optimal ratio. Hereinafter, an experimental method and results of obtaining an appropriate composition ratio of the color primer mixture will be described. Explain.

In general, when magnesium (Mg) material is applied for use as a back case material such as an electronic device, environmental temperature and humidity, etc., as a coating work environment variable are classified as external noise factors as non-adjustable factors and dried. The time, drying temperature and the like correspond to a work variable that can be set as a work condition as an adjustable factor that can determine the paint quality.

In the present invention, by adjusting the mixing ratio of the resin, the additive and the pigment constituting the color primer mixture together with the above settable working parameters, the coating test is performed to search for the optimum mixing ratio and to reduce the overall coating process time and to achieve optimal coating. It was made to calculate the coating process conditions which can show intensity | strength.

Figures 4a to 4c is a view showing the test results of the coating strength according to the drying temperature and time, the mixing ratio of the resin and the additive and the pigment constituting the color primer mixture in the coating process.

As an experiment for measuring the coating strength, the coating strength measurement was performed by a cross sutting tape test, and the measured result is represented by the y-axis. That is, after creating a scratch of 2 mm width and length, respectively, on the surface of the case material and attaching the tape to the scratch area, it is judged whether the scratch portion is fixed or not when it is detached. The area value is represented by Y. Therefore, the smaller the measured Y value, the more preferable the result.

As an experimental method, seven measurement conditions were set to measure five experiment results for each measurement condition.

Drying time and drying temperature were independent variables as process environment variables, and a predetermined section value within 15 minutes / 90 minutes for drying time and 70 ° C / 90 ° C for drying temperature was applied. In addition, the ratio of the resin, the additive, and the pigment constituting the pigment mixture in the mixture was set as another independent variable, and the coating film strength was measured for the coating film formed differently according to each ratio.

Temperature and humidity in the process environment were ignored as noise factors.

On the other hand, in order to derive the optimal process conditions, the chromium coating (Choromate coating) portion was maintained in the chromium coating completely peeled state completely excluded.

As a result of the experiment, referring to Figures 4a to 4c, as a result of confirming the reaction according to the component ratio according to the drying temperature and drying time it can be seen that no significant difference depending on the process conditions. However, the more the content of the resin (RESIN) the higher the strength, the higher the ratio of the additive (ADD) and the pigment (ANRO) was confirmed that the lower the strength.

That is, the reference line (x coordinate: 0.00) of the horizontal axis in FIGS. 4a to 4c represents the respective composition ratios of the resin, the additive, and the pigment constituting the color primer mixture in which the coating film can exhibit the optimum strength. Each component of the color primer mixture capable of exhibiting optimal strength by measuring the coating film strength of the coating film formed by varying the mixing ratio of the resin, the additive, and the pigment constituting the color primer mixture within a certain period. The composition ratio of can be obtained.

5 is a view showing the coating strength according to the mixing ratio of the resin, the additive and the pigment of the mixture, Figure 6 is a view showing the coating strength according to each independent variable factor in the strength test.

Referring to FIG. 5, the value Y (strength metering value) quantified inversely to the paint strength indicates that Y (strength metering value) is low in a region where the mixing ratio of resin (RESIN) is high, indicating a relatively good strength. can see.

In FIG. 6, D is a value representing degrees of freedom, indicating reliability of an experiment, and the closer the value is to "1", the more preferable value is. That is, when D is "1", it means that even if the experiment is performed by any experiment operator, the same result value as the previous experiment value can be obtained. In this experiment, it can be seen that D is 0.98115, which is an experimental data with more than 98% reliability.

Referring to Figure 6, the process time (temp) and the process temperature (temp) is in accordance with the change in the conditions for the process time and the process temperature between 15.0 minutes to 30.0 minutes, each drying range of 70 ℃ to 90 ℃ The change in strength characteristics is not much different.

However, the resins (RESIN), additives (ADD) and pigments (ANRO), which are components of the mixture, appear to change greatly in strength characteristics as the content ratio changes. When the fat factor is a large change in the Y (strength measurement value) as the content ratio is changed as described above, the fatal factor may be a resin * pigment, a resin * additive, an additive * pigment and a resin * additive * pigment. .

The table below shows the measurement of the regression coefficient for Y (strength metric).

term Coef SE Coef T P VIF RESIN 3.2 6.150 * * 1.599 ADD 146.2 6.150 * * 1.599 ANRO 146.2 6.150 * * 1.599 RESIN * ADD -156.6 69.751 -2.25 0.036 4.826 RESIN * ANRO -309.6 69.751 -4.44 0.000 4.826 ADD * ANRO -207.6 69.751 -2.98 0.007 4.826 ADD * ANRO * time -61.0 31.752 -1.92 0.069 1.000 ADD * ANRO * temp -49.2 31.752 -1.55 0.137 1.000

At this time, R-Sq (Regression-Square) was 96.94%, R-Sq (pred) was 93.76%, R-Sq (adj) was 95.87%. These results support the suitability of the regression equation.

Referring to FIG. 6, it can be judged that the blending ratio of resin * additive * pigment when the minimum value of Y (strength measurement value) represents 1.1697 mm 2 constitutes an optimal color primer mixture. When the process time is 22.5 minutes and the temperature is 80 ° C, the resin is 0.4631 (about 46%), the additive is 0.1280 (about 12%), and the pigment is 0.4088 (about 40%). It can be seen that optimal results can be obtained in the case of). Therefore, the optimum paint strength is exhibited when the mixing ratio of each resin and the additive and the pigment constituting the color primer mixture is resin: additive: pigment = 46: 12: 40.

As a result of coating the case material of magnesium (Mg) material according to the present invention using the color primer mixture according to the mixing ratio as described above, the process time is shortened by about 120 minutes compared to the conventional one, and the yield is also at 68.5% of the conventional case. It was effective to improve 11.5% to 80.0%.

In addition, the paint strength characteristics are improved to the point where the cross-cutting defect rate is close to 0% from the conventional 90%, and satisfies the desired design specification value even in the achromatic colors such as white and gray in the appearance color of the case material. It could be confirmed.

When applying the coating according to the optimal color primer mixture composition ratio in the coating process according to an embodiment of the present invention as described above may exhibit an optimum strength and yield increase, but in the actual painting process within the scope of the present invention According to the paint strength and color specification required by the present invention can be carried out in the color primer mixture blending ratio within a certain range from the optimal color primer mixture composition ratio.

The high gloss coating method using the color primer according to the present invention has been described in detail above. However, the present invention is not limited to the above embodiments, and many variations are possible by those skilled in the art within the spirit of the present invention. Therefore, changes and modifications are included in the present invention without departing from the spirit of the invention, such facts will be apparent to those skilled in the art.

According to the present invention, the process time is shortened by about 120 minutes compared with the conventional 12-step coating method for high gloss, and the yield is improved by 11.5% from 68.5% to 80.0%.

And by improving the coating strength characteristics there is an effect that the cross-cut failure rate is significantly reduced.

In addition, in the appearance color of the case material, not only the chromatic color but also the achromatic color such as white and gray can satisfy the desired design specification value.

Claims (5)

Forming a primer layer on the material surface; Forming a color primer layer using a color primer mixture in which a resin, an additive, and a pigment are mixed in a predetermined ratio; Forming a clear layer for high gloss on the color primer layer; High gloss coating method using a color primer, characterized in that comprises a. The predetermined ratio of claim 1, wherein the resin, the additive, and the pigment are mixed. A high gloss coating method using color primers, characterized in that the value obtained by the intensity test in which the mixing ratio of each component constituting the color primer mixture is applied is applied. delete The method of claim 1, wherein the pigment, High gloss coating method using a color primer, characterized in that it is a pigment of achromatic color system. The method of claim 1, wherein prior to forming the clear layer, And forming a pearl clear layer after the forming of the color primer layer is further performed.

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