JPH0140160B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming an uneven pattern on the surface of a mineral fiberboard that has excellent surface hardness and has a rich three-dimensional appearance without cracks generated during the formation of the uneven pattern appearing on the surface. It is.

Mineral fiberboard has traditionally been lightweight, fireproof,
Due to its excellent workability and heat insulation properties, it is widely used in many architectural decorative materials, including ceiling materials.Furthermore, in order to obtain a good appearance, three-dimensional structures are added to the surface by cutting or pressure forming. Many decorative boards with patterns are available.

However, mineral fiberboard is several steps inferior in strength to other inorganic building materials, such as cement-based building materials and tiles, so it is widely used in areas that are not subject to external forces, such as ceiling panels, It is difficult to apply it to parts that are subject to external forces such as impact forces on the surface, and in addition, ceiling materials with three-dimensional convex patterns formed on the surface are difficult to apply during construction or other handling. However, there was a drawback in that the convex portions were prone to chipping, and the chipped decorative board could no longer be used.

To eliminate these defects, there is a method of coating and impregnating synthetic resin on the surface layer of the fiberboard to strengthen the surface, but with this method, since the fiberboard is porous, the absorption of resin liquid is difficult. In order to form a hard layer on the surface, it is necessary to apply and impregnate a large amount of resin liquid, which increases the cost and increases the organic content, which impairs the nonflammability. Therefore, when the fiberboard surface is colored, there is a problem in that the entire surface becomes a single color, making the uneven pattern look flat and hindering the three-dimensional effect.

The present invention was made in view of these problems, and after providing a mixed paste layer of thermoplastic synthetic resin and inorganic pigment on the surface of a mineral fiberboard at a ratio of 500 g/m ² or more, the paste is While the layer is not dry, it is hot-pressed with a molding material to imprint the uneven pattern on the fiberboard, and at the same time, the paste layer is applied by the pressing force of the molding material along the inclined peripheral side of the projection of the molding material to the top surface of the convex part of the convex pattern part of the fiberboard. This is caused to flow to the side and hardened to form a hard layer on the top of the convexity, and at the same time, the surface color of the fiberboard is made to appear on the lower peripheral wall surface of the convex pattern, thereby creating irregularities with a rich three-dimensional effect and excellent surface hardness. The present invention provides a method for decorating the surface of mineral fiberboard, which is characterized by forming a pattern.

To explain the embodiments of the present invention with reference to the drawings, first, a thermoplastic synthetic resin:inorganic pigment is applied to the surface of a mineral fiber board 1 mainly made of mineral fibers such as rock wool and slag wool at a weight ratio of 1:3 to 1:3. Paste layer 2 prepared at a mixing ratio of 1:5 is coated at a ratio of 500 g/m ² or more.

Acrylic, acrylic styrene, vinyl acetate, etc. are used as the thermoplastic resin that is a component of the paste layer 2, and the inorganic pigments include white inorganic pigments such as tancal and clay, and colored inorganic pigments such as red iron oxide, iron oxide, and carbon black. Each of these may be used alone or a mixture of two or more of these may be used,
Further, an appropriate amount of additives such as a dispersant, a thickener, and an antifoaming agent may be mixed into the paint forming the paste layer 2.

Paste layer 2 to be painted on the surface of mineral fiberboard 1
The amount of coating depends on the type of inorganic pigment, but the amount of
It is preferable to provide it at a ratio of g/m ² or more in order to increase the surface hardness.

In addition, the reason why the mixing ratio of thermoplastic resin and inorganic pigment was set to 1:3 to 1:5 by weight as described above is that when the thermoplastic resin content increases from this ratio,
As the hiding power of the inorganic pigment becomes weaker, the coloring effect of the convex pattern areas that will be formed later decreases, and the difference in color between the convex pattern areas and the concave pattern areas becomes unclear, resulting in a lack of three-dimensional effect and the appearance of the fiberboard surface. This is because the mold releasability after heating and pressurizing with a mold material deteriorates.On the other hand, if the thermoplastic resin content is less than the above ratio, the fluidity of the inorganic pigment in the paste layer deteriorates, causing convexity of the fiberboard. This is because the patterned surface becomes the same color over the entire surface, reducing the three-dimensional effect and decreasing the adhesion to the fiberboard substrate and surface hardness.

Next, as described above, after providing the paste layer 2 on the surface of the mineral fiber board 1, this paste layer 2 is
While the fiberboard surface is not dry, the convex peripheral side surface 3
The uneven pattern 5 is imprinted on the surface layer of the fiberboard by heating and pressurizing the mold material 4 having the uneven pattern 3 formed on the inclined surface to compress and deform it.

At this time, the surface layer of the fiberboard is pressed and deformed by the molding material 4, and at the same time the paste layer 2 is also pressed. It is pushed up along the side surface 3a, flows and fills the gap between the top surface of the convex pattern part 5a on the surface of the fiberboard and the concave part of the shape material 4, and in this state it adheres to the surface of the convex pattern part 5a, forming a relatively thick hard layer. 6 is formed.

On the other hand, in the concave pattern portion 5b that is imprinted on the surface of the fiberboard, some of the inorganic pigment in the paste layer is transferred to the peripheral surface of the convex portion of the mold material 4 due to the pressing force from the flat surface of the convex top portion of the mold material 4. A thin hard layer 7 is formed by sticking as is without escaping to the 3a side, but most of the paste layer 2 from the outer peripheral surface of the concave pattern 5b to the lower part of the inclined peripheral wall of the convex pattern 5a is All of the fibers flowed toward the top of the convex pattern 5a due to the reaction force caused by the pressing, and as a result, the surface color of the fiberboard 1 appeared from the outer periphery of the concave pattern 5b to the lower part of the inclined peripheral wall of the convex pattern 5a. parts are formed.

The depth of the pattern formed on the fiberboard 1 is 4~
It is formed relatively deep at 8m/m.

In this way, a large amount of the inorganic pigment in the paste layer is pressed onto the top of the convex pattern portion 5a formed on the fiberboard 1 by heat-pressing the shape material 4, forming a hard layer 6, and from the concave bottom. A gradation colored layer 8 is formed in which the color due to the transmission of the surface color of the fiberboard 1 gradually becomes lighter toward the upper part of the inclined surface of the convex pattern portion 5a.
In particular, since the paste layer 2 is thickly applied to the surface of the mineral fiberboard 1, the paste layer 2 is first compressed and fluidized by the pressure of the shape material, and then the surface of the mineral fiberboard is compressed. By reducing the amount of compression of the mineral fiberboard itself, a large uneven pattern 5 is created.
can be formed. Therefore, there is little compressive destruction of the base material when forming the uneven pattern, and even if cracks occur at the corners or bottom of the recesses, the cracks will be covered or filled by the flowing paste and the cracks will be removed. does not appear on the surface.

In addition, the thermoplastic resin in the paste layer 2 is
When heated and pressurized, it penetrates into the gaps between the fibers on the surface of the fiberboard, and as it hardens, the entire surface of the fiberboard becomes a thin film of hardness.

The color of the surface of the mineral fiberboard 1 may remain grayish white at the time of papermaking, but it may also be given an appropriate color different from the color of the inorganic pigment in the paste.

Next, on the entire surface of the fiberboard 1 on which the uneven patterns 5a and 5b are formed, a transparent or translucent composite is applied so as not to impair the color change due to the flow of the paste layer 2 containing the inorganic pigment. A hard film 9 is provided by applying and drying a resin paint.

As such synthetic resin paints, aminoalkyd resins, urethane resins, polyester resins, etc. are used.

At this time, since the surface of the mineral fiberboard 1 is formed of an inorganic pigment layer containing a thermoplastic resin and a hard layer penetrated by the thermoplastic resin as described above, the paint hardly penetrates into the fiberboard 1. A good surface coating 9 is formed without any formation, and the hard layer 6,
The color shading of 7 and the blurred colored layer 8 and the gloss of this transparent coating 9 combine to form an appearance full of three-dimensionality and luxury, like a glazed tile.

In addition, before applying the transparent paint, a colored resin is applied in spots on the uneven pattern surface of the fiberboard 1.
By setting it to 0, it is possible to express the texture of a stone or pottery-like material, and it is also possible to apply various colors to the surface of the convex pattern by applying roll coating or the like.

As described above, in the present invention, the thermoplastic synthetic resin:inorganic pigment is added to the surface of the mineral fiberboard in a weight ratio of 1:3 to 1:3.
After applying a paste layer prepared at a ratio of 1:5 approximately uniformly, and while the paste layer is still wet, pressurizing the fiberboard surface with a mold material having an uneven pattern in which the circumferential side of the convex portion is formed into an inclined surface. At the same time as the uneven pattern is imprinted on the fiberboard by heating, the inorganic pigment of the paste layer is made to flow along the inclined circumferential side surface of the mold material to the surface of the convex pattern part of the fiberboard, and the hardened paste layer is applied to the apex of the convex part. A layer is formed and the surface color of the fiberboard is made to appear on the lower peripheral wall surface of the convex pattern part, and then a transparent or translucent synthetic resin paint is applied to the uneven pattern surface of the fiberboard and dried. Since this method relates to a surface decoration method for mineral fiberboard, it is possible to form a good hard coating layer on the mineral fiberboard without causing almost any paint absorption, and in particular, it is possible to form a good hard coating layer on the mineral fiberboard. Because it is hard and has a low compressibility, a hard layer made of a large amount of inorganic pigment is formed on the surface of the soft convex pattern that remains at a low density to protect the surface and protect it from external forces such as impact during handling or use. The result is a decorative board that is less susceptible to chipping or damage even when the molding material is pressed, and can be used not only as a ceiling board but also as a wall material.Furthermore, the paste layer flows due to the pressure of the mold material, and the concave pattern can be easily removed. The surface color of the fiberboard can be seen from the outside on the inclined peripheral wall surface between the convex patterns, and the difference between this color and the color created by the inorganic pigment layer at the top of the convex patterns creates a tile-like appearance that is extremely rich in three-dimensionality. It is possible to obtain a decorative surface having an appearance of In addition, since a thick paste layer is previously provided on the surface of the mineral fiberboard and then pressed with a mold material, even if a large uneven pattern is formed, the amount of compression of the base material is small and there is less damage to the base material. Even if cracks occur at the corners of the recesses, the cracks are covered with the paste and do not appear on the surface.

Furthermore, when the transparent or translucent synthetic resin paint that forms the finishing surface layer is applied, it is prevented from penetrating into the fiberboard by the hard layer on the surface of the fiberboard, and therefore a glossy coating can be formed with a small amount of application. This method has the advantage that it does not significantly reduce the nonflammability unlike the conventional impregnation method.

[Brief explanation of drawings]

The drawings show examples of the present invention, and FIG. 1 is a simplified cross-sectional view of a mineral fiberboard provided with a paste layer;
Fig. 2 is a cross-sectional view of the state in which the mold material is heated and pressurized, Fig. 3 is a cross-sectional view of the obtained fiber decorative material, and Fig. 4 is a cross-sectional view of the obtained fiber decorative material.
The figure is a plan view thereof. 1...Mineral fiberboard, 2...Paste layer, 3a
... Slanted circumferential side surface of mold material, 4 ... Shape material, 5 ... uneven pattern, 5a ... convex pattern part, 6, 7 ... hard layer, 8
...Blurred colored layer, 9...Transparent film.

Claims (1)

[Claims] 1. A paste layer containing a thermoplastic synthetic resin and an inorganic pigment adjusted to a weight ratio of 1:3 to 1:5 is approximately uniformly provided on the surface of a mineral fiberboard at a ratio of 500 g/m ² or more, and then the paste layer is While the fiberboard is not yet dry, the surface of the fiberboard is pressed and heated using a shape material having an uneven pattern in which the circumferential side of the convex portion is formed on an inclined surface to imprint the uneven pattern on the fiberboard.At the same time, the paste layer is applied to the shape material. A hard layer is formed by hardening the paste layer on the convex apex by flowing the fiberboard along the inclined circumferential side surface to the surface of the convex apex of the convex pattern, and at the same time, the surface color of the fiberboard is applied to the lower peripheral wall surface of the convex pattern. 1. A surface decoration method for a mineral fiberboard, which comprises: exposing the surface of the fiberboard, and then applying a transparent or translucent synthetic resin paint to the entire surface of the fiberboard having an uneven pattern, and drying the coating.