JPH0137265B2 - - Google Patents

Description

[Detailed Description of the Invention] An object of the present invention is to provide a ricin-like steel plate that can be easily post-formed, and is particularly suitable for use as spandrels, which are exterior wall panels for buildings, corrugated siding plates, etc. It is something.

Conventional Rishin steel plates are produced by coating a steel plate with an undercoat, then scattering hard aggregates such as quartz particles or silica sand on top of the undercoating paint while it is still wet, then applying a surface finishing paint on top of that, and then drying it. The above-mentioned aggregate, or something similar thereto, was mixed into paint and painted on a steel plate.

The above had the following problems.

Quartz particles, silica sand, etc. used as aggregates have high hardness, and in the case of ricin steel sheets that are made by dispersing such aggregates before forming, the aggregate particles tend to fall off during forming.
Grooves were formed at this location, and the paint film surface around the area was also damaged by the fallen particles.

Furthermore, not only during processing but also during transportation and construction, aggregates fall off and the coating surface is damaged, which greatly reduces the durability of the coating layer.

Furthermore, the blade of the slitter would chip during cutting, and the surfaces of the press mold and processing roll would quickly become rough, resulting in a shortened lifespan of the processing tool.

Because of the above-mentioned problems, methods such as applying a thin resin sheet to the surface of the ricin-coated steel plate as a protective film during molding before molding have been considered, but such methods also have the above-mentioned problems. Although it could only slightly reduce the amount of damage, it did not result in a substantial improvement, and instead led to an increase in costs.

One method to solve the above problem is to form the steel plate in advance and then apply lysine coating to the surface, but in this case, it is limited to molded products with a simple shape, and even then, sufficient coating is applied to every corner. It is difficult to apply ricin, and since each molded product is coated with ricin, the total coating time is longer and the manufacturing cost is higher than when painting the steel plate before the material is taken.

The present invention solves the above-mentioned problems, and its features include coating a surface-finishing paint on a surface-treated steel plate, forming a protective coating layer that is baked and dried, and on the protective coating layer, Mica bone is formed by forming a ricin-like coating layer sparsely enclosing aggregate of a size that passes through 10 meshes, and the aggregate is made by adhering and enclosing several pieces of mica with an adhesive. The material is ricin-like steel plate.

To further explain the above structure in detail, the surface treatment performed on the steel plate is performed by appropriately selecting chemical conversion treatment, plating treatment, and other base treatment for painting, and the protective coating layer is the surface treatment performed on the steel plate. This corresponds to the base layer of a ricin-like coating layer that sparsely envelops materials. The various properties required of this base layer include adhesion, rust prevention, weather resistance, and other desired properties.

This coating layer is formed from one to three layers. This coating layer is prepared by mixing a resin coating solution with desired additives such as pigments, rust preventives, etc.
Formed by 3 coats. For example, in the case of two-layer coating, the first layer is a coating layer of epoxy resin paint or polyester resin paint mixed with desired additives to improve adhesion and rust prevention, and then the second layer is a coating layer of epoxy resin paint or polyester resin paint mixed with desired additives to improve adhesion and rust prevention. Forms a coating layer of urethane resin paint or polyester resin paint that has excellent properties.

Next, the aggregate made of mica particles will be explained. The particle size of 10 mesh or less is suitable for the molding processing conditions, and the particles are manufactured using a granulation device. In this method, mica pieces preferably having a size of 100 mesh or less are kneaded into an adhesive containing a coloring agent such as a coloring pigment, and while stirring and drying, particles of a desired size are selected using a sieve. The structure of the particles thus produced is roughly as shown in FIGS. 1 and 2.

FIG. 1 shows flat mica particles made by hardening plate-shaped mica pieces 1 with an adhesive 2. A coloring agent is added to the adhesive 2 to form colored mica particles. Figure 2 shows the colored mica particles in Figure 1 further hardened with clear paint, and three colored mica particles 3...
... are combined with clear paint 4. As the adhesive, urea-based melamine resin and various other synthetic resin-based adhesives can be used.

Next, the coating layer that sparsely encloses the aggregate is a clear coating that has good adhesion to the protective coating layer, and is preferably a polyester resin coating.

Next, the manufacturing process of the ricin-like steel plate of the present invention will be explained. FIG. 3 is a schematic manufacturing process diagram, in which a galvanized steel sheet 5 is pulled out from an uncoiler 6, surface-treated in a treatment tank 7, coated with a primer in a coating machine 8, and then coated with a baking furnace 9.
Baked and dried to form a primer layer (first protective coating layer). Next, a coating machine 10 coats the surface to form a second protective coating layer, a coating machine 11 coats the back surface, and a baking oven 12 bakes and dries.

Next, a coating layer for adhering the aggregate is formed using a coating machine 13,
Aggregate 22 is applied to the spraying device 14 while the coating layer is still wet.
is sprayed, curtain flow coated with a coating machine 15, and baked and dried in a baking furnace 16 to form a ricin-like layer sparsely enclosing aggregate. 17 is a recoiler.

Reference numeral 18 denotes a baking oven, which is used to dry the coating layer for bonding aggregates when there is a concern that the aggregates may move. FIG. 4 is a cross-sectional view of the main parts of the ricin-like steel sheet of the present invention produced by the above manufacturing process, in which 5 is a galvanized steel sheet, 19 is a protective coating layer consisting of two layers: a primer layer 20 and a surface layer 21, 25 The clear coating layer 22 for bonding aggregate is aggregate made of mica particles, 23
is a clear coating layer. 24 is a back coating layer.

In the above manufacturing process, the enclosing coating layer 29 of the ricin-like coating layer 28 that sparsely encapsulates the aggregate 22 is formed into two layers: a clear coating layer 25 for adhering the aggregate and a clear coating layer 23 on the surface. However, these may have the same ingredients or may have slightly different ingredients. If the aggregate is kneaded into the clear paint and then painted, it will form a single layer of paint and can be applied by curtain flow painting, roll painting, etc. Next, various embodiments of the ricin-like steel plate of the present invention will be comprehensively described.

The primer layer of the protective coating layer is an epoxy resin paint polyester resin paint, which is applied with a viscosity Ford Cup No. 4 for 20 to 50 seconds in a hot air chamber at 50° C. in a coating amount of 2 to 8 g/m ² . Alternatively, it may be baked and dried. The surface layer of the protective coating layer is a polyester resin paint or a urethane resin paint, which has a viscosity of 10 to 30 g/m ² and is applied using a food cup No. 4 for 80-120 seconds at a board temperature of 180° to 220°C. The paint for the primer layer or the paint for the surface layer contains anticorrosive pigments and other desired additives.

The clear coating layer is a polyester resin coating and has a viscosity of Ford Cup No. 4, 50 to 100 seconds. The coating layer for aggregate adhesion has a coating amount of 3 to 5 g/m ²
It is. The coating layer covering the aggregate on the surface has a coating weight of 30 to 40 g/m ² and a board temperature of 200 to 250°C.

The amount of aggregate to be spread is 10 to 30 g/m ² .

The particle size composition of aggregate is approximately 10% 30-40 mesh.
Approximately 80% of cases are between 40 and 80 meters, and approximately 80% are between 80 and 100 meters.
It is 10%. I also mix things of various colors.

The amount of the aggregate adhesion paint and coating paint applied and the amount of aggregate sprinkled are not limited to the above amounts as long as the aggregate does not fall off during processing and problems such as foaming do not occur.

For example, vinyl chloride resin paint does not foam even when applied as thick as 260g/ ^m2 , so it can be applied thickly. Thick coating increases aggregate retention and improves rust prevention.

Furthermore, as the amount of aggregate spread increases, the surface area increases, so if the amount applied is constant, the covering coating layer becomes thinner and the wrapping power becomes weaker. In this case, the coating amount and spraying amount may be appropriately selected depending on various conditions, such as increasing the coating amount of the coating film layer.

In this example, the aggregate is colored, and the paint for adhering the aggregate and the coating paint are clear paints, so the colored aggregate gives a beautiful appearance and the color of the protective coating surface is resistant to fading.

In addition, since the paint for adhering the aggregate, aggregate scattering, coating, and baking drying are performed in a series, even if colored aggregate is simply sprayed, the coloring agent of the aggregate will not be dissolved in the solvent in the paint, so the aggregate Coloring becomes easier.

FIG. 5 is another schematic manufacturing process diagram, and FIG. 6 is a cross-sectional view of a steel plate coated with ricin.

From the surface treatment tank 7 to the baking furnace 12 for the surface finish coating.
Since the steps up to this point are the same as those in the first embodiment, the explanation will be omitted.

The process after the protective coating layer 19 is formed is to roll coat or flow coat with a coating machine 26 while mixing the paint containing aggregate, and bake dry it in a baking oven 27 to combine the aggregate 22' and the aggregate. Surrounding coating layer 2
9 to form a ricin-like coating layer 28.

The paint is a clear paint made of polyester resin. The aggregate 22' has a structure similar to that shown in FIG. 1. Specifically, mica pieces with a particle size of 100 mesh are heated and fired, the mica itself is colored, and multiple mica pieces are bonded with a clear adhesive. It is a particle that contains .

The size of the aggregate is similar to that in the first embodiment. The adhesive of this aggregate is clear, and the mica pieces themselves are colored, so even if they are mixed into the paint, there is no worry that the color will dissolve with the paint's solvent, and the beautiful lysine-like Form a coating layer.

Furthermore, as shown in Fig. 2, if mica pieces 1 are colored and supported with coloring agent 2, and aggregate 22'' is further supported with clear adhesive 4, even if mixed into the paint, the coloring agent 2 will not be absorbed. There is time for it to dissolve into the paint, so the second
Used in the example.

As described above, the present invention can be applied at the time of molding, transportation,
Even if the aggregate falls off during construction, the durability will not decrease much because the protective coating layer formed by applying surface finish paint and baking and drying remains.

In addition, several pieces of mica crushed to a size smaller than the desired size of the aggregate are adhered and wrapped with an adhesive to form the mica aggregate of the desired size, which improves the productivity of the mica aggregate, for example, for manufacturing it into granules. Since the yield rate and production speed are not degraded, and the aggregate is not broken into small pieces before painting, it is possible to obtain a coated steel plate having a ricin-like surface of a desired size.

In addition, since the aggregate consists of particles in which a plurality of mica pieces are adhered and encapsulated with an adhesive, it is softer and has higher deformability than conventional quartz particles, silica sand, etc.

That is, the hardness of quartz is 7th on the Mohs hardness scale, and the hardness of mica is 2 to 3 on the Mohs hardness scale. Mica is soft, so it does not damage processing tools like in the past, and since multiple pieces of mica are glued together, it has high deformability and does not easily fall off during processing. For this aggregate, large particles that do not pass through 10 meshes will have a high catching resistance during the molding process and risk falling off, so it is best to use aggregate that can pass through 10 meshes, and the particle size composition should be within an appropriate range. All you have to do is choose. Furthermore, since the aggregate is surrounded by a coating film, it is difficult to fall off.

As described above, manufacturing costs are reduced because processing is easy and simple, and the time required for coating with lysine is shortened in total. It also has the advantage that it can be easily used by processing companies that do not have painting equipment but only molding equipment.

[Brief explanation of drawings]

1 to 6 are explanatory diagrams of embodiments of the present invention, in which FIG. 1 is a cross-sectional view of an aggregate particle, FIG. 2 is a cross-sectional view of another aggregate particle, and FIG. 4 is a sectional view of the main part of the ricin-like steel plate, FIG. 5 is a schematic manufacturing process diagram of another example, and FIG. 6 is a sectional view of the main part of the ricin-like steel plate of another example. be. (Explanation of symbols), 1... Mica piece, 2... Adhesive,
5... Steel plate, 19... Protective coating layer, 22, 22',
22″...mica aggregate, 28... ricin-like coating layer.

Claims (1)

[Claims] 1. Paint a surface finishing paint on a surface-treated steel plate, bake and dry to form a protective coating layer, and sparsely sprinkle aggregate with a size that will pass through 10 meshes on top of the protective coating layer. 1. A ricin-like steel sheet formed with a ricin-like paint film layer, characterized in that the aggregate is a mica aggregate formed by adhering and supporting several pieces of mica with an adhesive.