TWM643298U - Two-coat two-bake powder coating structure - Google Patents

Abstract

The present invention relates to a two-coat and two-baking powder coating structure. The most important thing is that when the topcoat layer is baked after electrostatic spraying, the high-concentration migratory toner in the primer layer will permeate and diffuse into the toner-free topcoat layer. The principle is to loosen the molecular chains of the primer layer through the molecules of the migratory toner during the second baking process, so that the small molecular migratory toner can penetrate and diffuse evenly into the primer layer through the interface between the primer layer and the topcoat layer. In the topcoat layer, when the topcoat layer cools down, the migratory toner will solidify in the topcoat layer, thereby improving the color difference of the topcoat layer.

Description

Two-coat and two-baked powder coating structure

The present invention relates to the technical field of powder coating, in particular to the technical category of a two-coat and two-baking powder coating structure.

With the improvement of people's aesthetic requirements, it has become a trend to pursue the high aesthetic feeling of coatings. Metallic, pearlescent or color-effect powder coatings can show a luxurious decorative effect from crystal-like metallic luster to satin-like pearl brightness, so they are widely used in the spraying of furniture accessories, sports equipment and automobiles.

In the past, coating methods for metal substrates mostly required two-coating and two-baking processes. Firstly, a primer layer was applied to seal the substrate, and then toner was added to the topcoat coating, which was applied to the primer layer and then baked to allow the topcoat layer to adhere to the primer layer to achieve the color effect of two-coating and two-baking.

However, the above-mentioned topcoat layer is prone to color difference due to uneven film thickness, and even the sag on the edge of the metal substrate is caused by accumulation of topcoat colorant. Therefore, the conventional two-coating and two-baking powder coating structure process needs to be improved.

Therefore, in view of the above-mentioned problems in conventional two-coating and two-baking powder coating, the creators of the present invention have devised a two-coating and two-baking powder coating structure with great thought. Therefore, the main purpose of the present invention is to provide a two-coating and two-baking powder coating structure that does not cause chromatic aberration due to the uneven film thickness of the top coat layer.

In order to achieve the above purpose, the present invention adopts the following technical means: a two-coating and two-baking powder coating structure, which includes: a primer layer, which is a primer powder added with migratory toner, and then electrostatically coated on the surface of the metal substrate, and the primer layer is formed after the first baking; The temperature of the layer, and the density of the primer layer is greater than the density of the topcoat layer, so that the toner can penetrate and diffuse into the topcoat layer evenly, and then solidify into the topcoat layer and the primer layer after cooling down.

The primer layer is made of a 100% primer coating consisting of 45%-99% powder coating resin, 0.5%-2% leveling agent, 3%-10% hardener, 0.1%-15% migrating toner, 0.2%-1.5% defoamer, and 0.1%-40% filler.

The topcoat layer is composed of 90%-99% of powder coating resin, 0.5%-2% of leveling agent, 3%-10% of hardener, 0%-10% of gloss adjustment additive, and 0.2%-1.5% of defoamer, which constitutes 100% primer coating.

The migratory toner is a small molecule organic toner, its particle size is set between 0.01um~10um, and its molecular weight is between 180~1000.

Said primer layer is set as a plane, wrinkled, vertical or sandy textured surface.

The topcoat layer is set as a glossy, flat, matte, transparent or translucent topcoat layer.

The present invention uses the above-mentioned technical means to achieve the following effects:

1. During the baking process of the topcoat layer, the new type migrates from the primer layer and evenly oozes migratory toner molecules and diffuses in the topcoat layer. After the topcoat layer is cooled and solidified, a surface coating without color difference is formed.

2. This new type is in the process of applying and baking the topcoat layer, even if the topcoat layer is accumulated on the drooping part of the edge of the metal substrate, there will be no color difference.

A: Powder coated structure

1: Metal substrate

2: primer layer

3: Topcoat layer

4: Toner

B: Application method of powder coating structure

a: steps

b: step

c: step

d: steps

e: step

[Fig. 1] is a schematic diagram of the new "two-coated-two-baked powder coating structure".

[Fig. 2] is a schematic diagram of the new migratory toner molecules uniformly permeating through the primer layer with high concentration of toner and diffusing into the topcoat layer without toner.

[Fig. 3] is a flow chart of the steps of the new "two-coating and two-baking powder coating structure application method".

First, please refer to FIG. 1 , the present invention relates to a powder coating structure A with two coats and two bakes.

The primer layer 2 is a primer powder added with migratory toner 4, then electrostatically coated on the surface of the metal substrate 1, and then baked at high temperature for the first time and cooled to form the primer layer 2; further, the primer layer 2 is composed of 45%~99% of powder coating resin, 0.5%~2% of leveling agent, 3%~10% of hardener, 0.1%~15% of migratory toner, 0.2%~1.5% of defoamer, filler 0 .1%~40% constitutes 100% primer coating; further, the powder coating resin can be epoxy type, epoxy polyester mixed type, pure polyester type, PU type, acrylic type, PE type or Nylon type; the leveling agent can be acrylic type, silicon type or fluorine type; among them, no hardener is required for epoxy polyester mixed type, PE type, Nylon type powder coating resins, while other powder coating resins can use related amino, TGIC, HAA, PU isocyanate, DDDA bis-acid base and other powder coating hardeners; the migrating toner can include dyes, pigments, fluorescent toners and other small molecular organic toners, the particle size is set between 0.01um~10um, and its molecular weight is between 180~1000; the type of defoamer includes benzoin, waxes, Silicon, fluorine, etc.; the filler generally refers to various inorganic metals and ores, such as aluminum powder, copper powder, pearl powder, barium sulfate, calcium carbonate, titanium dioxide, clay, etc.

The topcoat layer 3 is electrostatically coated with a topcoat powder on the surface of the primer layer 2, and after the second baking in sequence, the migratory toner 4 in the primer layer 2 will migrate and diffuse into the topcoat powder, as shown in Figure 2, after cooling down, the topcoat layer 3 and the primer layer 2 are solidified; further, the topcoat layer 3 is composed of powder coating resin containing 90% to 99%, 0.5% to 2% of a leveling agent, and 3% to 10% of a hardener. 0%~10% gloss adjustment additive and 0.2%~1.5% defoamer constitute 100% primer coating; further, the powder coating resin can be epoxy type, epoxy polyester mixed type, pure polyester type, PU type, acrylic type, PE type or Nylon type; the leveling agent can be acrylic type, silicon type or fluorine type; among them, epoxy polyester mixed type, PE type, Nylon type powder coating resin does not need to use hardener, while other powder coating resins Related powder coating hardeners such as amino, TGIC, HAA, PU isocyanate, DDDA bis-acid group can be used; the gloss adjustment additive can be used or not, and the gloss adjustment additive can be used in different proportions to obtain a glossy, flat, matte, transparent or translucent topcoat layer 3.

The above-mentioned primer layer 2 and topcoat layer 3 constitute the novel two-coating-two-baking powder coating structure A of the present invention. As shown in FIG. The migratory toner 4 migrates in the paint layer 2 and oozes uniformly into the toner-free topcoat layer 3, and forms a surface coating without color difference after being cooled and solidified. The principle is to loosen the molecular chains of the primer layer 2 through polymers during the heating process, so that the small-molecule migratory toner 4 can penetrate and diffuse evenly from the lower primer layer 2 to the upper topcoat layer 3 through the interface with the topcoat layer 3; By virtue of this principle, during the baking process of the application of the topcoat layer 3, even if the topcoat layer 3 accumulates at the edge of the metal substrate 1 due to the accumulation of the topcoat layer 3, there will be no color difference.

Regarding the application method B of the two-coating and two-baking powder coating structure implemented in the new powder coating structure A of the present invention, as shown in Figures 1, 2 and 3, it includes: a step of adding toner a, adding migrating toner 4 to the base powder to form a primer powder; a primer powder coating step b, electrostatically coating the primer powder on the surface of the metal substrate 1; 0°C, baking for 5-20 minutes; top coat powder coating step d, is to electrostatically coat the top coat powder on the surface of the primer layer 2; and a second baking step e, is to bake the top coat powder, the baking temperature is set at 130°C-240°C, and bake for 5-20 minutes, so that the migratory toner 4 in the primer layer 2 can penetrate and diffuse into the top coat powder evenly, and after cooling and solidification, the top coat layer 3 and the primer layer 2 are formed. The surface of the metal substrate 1 receives a colored coating.

Further, in the primer powder coating step b, the primer powder is electrostatically coated on the surface structure of the metal substrate 1 to make the surface structure of the primer layer 2 such as plane, wrinkle, vertical grain or sand pattern; further, in the second baking step e, through the adjustment of gloss adjustment additives in different proportions, a topcoat layer 3 with bright light, flat light, matte, transparent or translucent, etc. is obtained, and then the surface of the metal substrate 1 is obtained with different color coatings.

To sum up, this new model is related to a two-coated and two-baked powder coating structure, and its structure has never been published in books or public use. It really meets the requirements for a new patent application. I sincerely hope that the bureau will grant the patent as soon as possible, and I will pray for it.

It needs to be stated that the above is the technical principle used in the specific embodiment of this case. If the changes made according to the concept of this case do not exceed the spirit covered by the instructions and drawings, they should be stated within the scope of this case.

A: Powder coated structure

1: Metal substrate

2: primer layer

3: Topcoat layer

4: Toner

Claims (6)

A two-coat and two-baking powder coating structure, comprising: a primer layer, which is a primer powder added with migratory toner, and then electrostatically coated on the surface of a metal substrate, and the primer layer is formed after the first baking; The density of the topcoat layer is such that the migratory toner can evenly penetrate and diffuse into the topcoat layer, and solidify into the topcoat layer and primer layer after cooling down. The two-coating and two-baking powder coating structure as described in Claim 1, wherein the primer layer is made of 100% primer coating composed of 45%~99% powder coating resin, 0.5%~2% leveling agent, 3%~10% hardener, 0.1%~15% migrating toner, 0.2%~1.5% defoamer, and 0.1%~40% filler. The powder coating structure of two-coating and two-baking as described in Claim 1, wherein the topcoat layer is made of 100% primer coating comprising 90%-99% of powder coating resin, 0.5%-2% of leveling agent, 3%-10% of hardener, 0%-10% of gloss adjustment additive, and 0.2%-1.5% of defoamer. The two-coating and two-baking powder coating structure as described in Claim 1, wherein the migration toner is a small molecular organic toner, its particle size is set between 0.01um~10um, and its molecular weight is between 180~1000. The two-coated-two-baked powder coating structure as described in Claim 1, wherein the primer layer is set as a flat, wrinkled, vertical or sandy structured surface. The two-coated-two-baked powder coating structure as described in Claim 1, wherein the topcoat layer is set as a glossy, flat, matte, transparent or translucent topcoat layer.

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