JPS5857300B2 - Decorative board manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a decorative board used for a cabinet for a television receiver, etc., and is for manufacturing a decorative board with excellent appearance, anti-blocking buttons, and other machinability. The present invention provides a manufacturing method that makes it possible to

When manufacturing cabinets and the like for television receivers, natural high-grade wood is expensive, so inexpensive decorative boards such as plywood laminated with resin films are often used.

When it comes to decorative boards like this, Ohji says the following three points are important.

The first is to obtain a surface condition with a three-dimensional effect as close to that of natural wood as possible in order to improve the appearance.

For this purpose, the resin film to be laminated is subjected to printing, embossing, or wiping coating, but it is necessary that these treatments can be performed easily and satisfactorily.

Second, when manufacturing these cabinets, decorative boards are often piled up and are often hit by other objects during close use, so they must not stick to them, that is, have sufficient tracking resistance. That's true.

Third, it can be easily cut and bent when manufacturing cabinets, that is, it has excellent machinability.

In particular, when forming a ■-shaped groove on the back side of a decorative board and bending it, it is necessary that the surface does not whiten or crack.

In addition, moisture resistance, heat resistance, etc. may also be required.

However, among the decorative laminates that have been widely used in the past, there are few that satisfy all of these conditions, and the reality is that a satisfactory decorative laminate has not been obtained.

In view of the above, an object of the present invention is to provide a manufacturing method capable of manufacturing a decorative board that is excellent in appearance, anti-blocking button, machinability, and other properties.

For this reason, in the present invention, a vinyl chloride film with an uneven surface by embossing etc. is applied to the surface of a base material such as plywood, and a wiping coating is applied to the surface to create a three-dimensional effect. Furthermore, it is characterized in that it is coated with an acrylic-polyisocyanate resin as a main component, thereby satisfying anti-blocking properties and other properties.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The method for manufacturing a decorative board of the present invention will be described below with reference to drawings showing one embodiment of the manufacturing process.

Referring to the figure, reference numeral 1 is a cabinet base material made of inexpensive plywood, and as shown in FIG.

This vinyl chloride film 2 mainly has the effect of improving mechanical processability, and its thickness is 0.1~
Approximately 0.5 peaks are appropriate.

In addition, concave portions 4 and convex portions 5 are formed on the surface by roll pressing, up-down pressing, etc. to make the surface uneven.

The shape of the unevenness is optimal if it is in the shape of a wood pipe that appears on the surface of natural wood, so-called wood grain shape, and in this case, the depth of the recess 4 is suitably about 0.05 to 0.4 peaks.

Next, wiping coating is applied so that the paint remains in the recesses 4 on the surface of the vinyl chloride film 2 coated on the base material 1 in this manner.

In this embodiment, highly efficient wiping coating is achieved by using powdered paint.

That is, a suspension of colored powder such as pigment or resin in a solvent is used as a wiping paint, and this is applied to the surface of the vinyl chloride film 2 having an uneven surface, dried to form a powder, and then Later, the colored powder adhering to the convex portion 5 is removed by scattering with a cloth puff or the like, so that the colored powder remains only in the concave portion 4.

As the colored powder used in the wiping paint, resin powder having a particle size of about 50 μm or less, or commonly used organic or inorganic pigments can be used.

Further, as the solvent for suspending this, any solvent that does not alter the quality of the colored powder or the vinyl chloride film and is stable against them can be arbitrarily selected and used.

For example, aliphatic hydrocarbon solvents such as cycloparaffinic solvents or normal paraffinic solvents, alcohols, etc. are suitable.

If it is desired that the colored powder remains in the recess 4 more reliably, an organic binder of 15 weight φ or less may be added in addition to the above.

For example, saturated or unsaturated fatty acids such as soybean oil, castor oil, or olefinic acids can be used.

If the amount added exceeds 15% by weight, it is not preferable because it will adversely affect the scattering of the colored powder on the curved portion.

Then, the paint as described above is applied to the entire surface of the vinyl chloride film 20, and dried to diffuse the solvent, so that the colored powder 6 is attached as shown in FIG.

In this case, since more paint is often applied to the concave portion 4 than to the convex portion 50, the drying of the concave portion 4 tends to be delayed, but as will be described later, the paint is mainly applied to the convex portion 5. Since the colored powder 6 is scattered, it is sufficient that only the convex portions 5 are sufficiently dry, and the inside of the concave portions 4 may be slightly insufficiently dried.

Once the paint has dried in this way, the third
As shown in the figure, the colored powder 6 adhering to the convex portion 50 is scattered and removed using a mechanical buff 7 such as a rotary cloth puff.

At this time, it is convenient to collect the removed colored powder 6 using a vacuum dust collector or other dust collector, or to scatter it by blowing air.

In addition to the rotary cloth puff, cotton cloth or the like may be used.

In either case, since the dried colored powder 6 is scattered, it hardly adheres to the mechanical buff 7.
Moreover, even if it adheres, it can be removed very easily by vibrating or the like.

Therefore, this method has the advantage of being easy to carry out continuously and can be automated.

Further, since the mechanical buff 7 does not adhere, the colored powder 6 can be scattered in almost the same state at all times, which has the advantage of making the quality uniform.

Once the wiping coating is completed as described above, the wiping-coated vinyl chloride film 2 is further shown.
A coating layer 8 is provided by applying a colored or non-colored transparent paint mainly composed of acrylic-polyisocyanate resin to the 0 surface.

By providing the coating layer 8 mainly composed of acrylic-polyisocyanate resin in this manner, it is possible to improve the blocking resistance and mechanical processability of the surface of the button.

As a curing agent for this acrylic-polyisocyanate resin paint, adduct type and polymerized polyisocyanate compounds used in general paints can be used, but in order to speed up the curing speed and improve blocking resistance, It is preferable to use a polymerizable polyisocyanate compound.

Furthermore, in order to further improve the blocking resistance, it is effective to add polyethylene resin fine powder, silicone resin, etc., but it has been found that when both are used in combination, even better properties are exhibited due to their synergistic effect.

The polyethylene resin powder used here has a melting point of 100 to 110°C (ASTMDI27) and a freezing point of 9.
0-100°C (ASTM D938), hardness 1-3
(ASTM D] 321, measured at 25° C.) and a particle size of 20 μm or less are preferred.

Further, the amount of polyethylene resin powder blended is preferably 4 to 8 weight more than the solid content of the acrylic polyol.

Regarding blocking resistance, when the amount is less than 4, there is no tendency to have a favorable effect, and when it is added more than 8%, there is no significant difference in the effect, and on the contrary, it causes unusual disadvantages in terms of the appearance of the coating film.

As the silicone resin, polyether-modified silicone oil and olefin-modified silicone oil are preferred.

The amount of silicone resin to be blended is preferably 2 to 6 weight percent based on the solid content of the acrylic polyol.

If it is less than 2, there is no effective effect on improving blocking resistance, and if it is more than 6, bubbles will be generated during coating and pinholes will be likely to occur in the coating film, which is not preferable.

Although the blocking resistance is improved even when these polyethylene resin powder and silicone resin are added alone, the most remarkable effect is produced when both are used together in the above blending amounts.

Furthermore, in order to further improve the machinability of such decorative laminates, it is effective to add a vinyl chloride copolymer resin to the coating resin.

As vinyl chloride copolymer resins that can be used, vinyl chloride-vinyl acetate-based resins, particularly vinyl chloride-vinyl acetate-vinyl alcohol-based resins, are particularly good. degree is 40
A value of 0 to 500 is preferable.

The blending amount of the vinyl chloride copolymer resin is preferably 3 to 8 weight φ based on the solid content of the acrylic polyol.

If the diameter is less than 3φ, no effective improvement effect is observed, and if it is greater than 8φ, the blocking resistance decreases.

As described above, if at least one of polyethylene resin fine powder, silicone resin, and vinyl chloride copolymer resin is blended with acrylic-polyisocyanate resin, a coating composition with excellent blocking resistance and machinability can be obtained. can be obtained.

Examples Aliphatic hydrocarbon solvent (normal paraffin with distillation range of 175-190°C) 30.0 parts by weight Kijirole
50 parts by weight butyl acetate
50 parts by weight carbon black Fwl
15 parts by weight Shinkasha Red
40 parts by weight Yellow pigment (Permanent Yellow HR-01, manufactured by Hoechst) 55 parts by weight Soybean oil 5 parts by weight Silicon dioxide fine powder 8 parts by weight The above mixture was uniformly mixed and dispersed with an attritor (with a finesse gauge, (5μ or less), a wiping paint was obtained.

Next, on the plywood laminated with the wood grain embossed vinyl chloride film, 100 parts of the above paint was diluted by adding 20 parts of thinner (normal paraffin with a distillation range of 175 to 190°C), and a mixture was applied using a roll coater (sponge roll). ).

Next, the applied paint is continuously pushed into the conduit portion, that is, the recess, of the vinyl chloride film using a reverse roll coater (steel roll), and excess paint is scraped off.

After drying at 50° C. for 3 minutes, balancing is performed using a rotating puff equipped with a mop to scatter the colored powder on the convex portions.

On the other hand, acrylic polyol (manufactured by Acrydic Dainippon Ink & Chemicals Co., Ltd.) A-813,500 parts by weight Cyroid 162 20 parts by weight Silicone oil (KP-354, manufactured by Shin-Etsu Chemical Co., Ltd.)
10 parts by weight 20 parts by weight of polyethylene fine powder (Sasol Wax H1-N3, manufactured by Sasol Corporation) A mixture of 50 parts by weight of a 20% MEK solution of vinyl chloride resin (Electrified Vinyl N0100OG (manufactured by Denki Kogyo ■) was homogenized using a roll mill. Mix and disperse (10μ or less using finesse gauge),
A main ingredient for coating paint was obtained.

In addition, a mixture consisting of 600 parts by weight of polyisocyanate resin (Suprasek 3340 manufactured by Nippon Polyurethane Industries Ltd.) and 400 parts by weight of ethyl acetate was uniformly mixed and stirred to obtain a curing agent to be added to the coating material.

Then, mix uniformly in a ratio of base agent: hardening agent =] 00:40, thinner (20 parts of ethyl acetate, 3 parts of butyl acetate).
0 parts and 50 parts of Kijiroll) were added to the base resin-curing agent mixture in an amount of 15 weight φ, diluted, and applied to the surface of the vinyl chloride film after wiping coating using a roll coater (rubber roll).

The drying was carried out at 50°C for 20 minutes. When various tests were conducted on the decorative board thus prepared, excellent results were obtained as shown below.

After that, the test piece was left at room temperature for 14 days, and the back plywood part of the test piece was cut into a 90° V-shaped groove, leaving only the vinyl chloride film.

Bend this thing 90' and the paint film will crack at the bent part.
Check for whitening and adhesion.

As described in detail above, according to the present invention, it is possible to produce a decorative board that has excellent three-dimensional appearance, blocking resistance, machinability, and other properties.

[Brief explanation of the drawing]

FIG. 1, FIG. 2, the third rotation, and FIG. 4 are cross-sectional views of a decorative laminate that undergoes a manufacturing process of an embodiment of the decorative laminate manufacturing method of the present invention. DESCRIPTION OF SYMBOLS 1... Substrate, 2... Vinyl chloride film, 3... Adhesive, 4... Concavity, 5...
... Convex portion, 6 ... Colored particles, 7 ...
...Mechanical puff, 8...Coating layer.

Claims (1)

[Scope of Claims] 1. A vinyl chloride film with an uneven surface is placed on a substrate such as synthetic material, and a wiping coating is applied so that the paint remains in the concave portions of the vinyl chloride film. A method for producing a decorative board, which comprises providing a coating layer mainly composed of acrylic-polyisocyanate resin on the surface of a vinyl chloride film that has been subjected to a wiping coating. 2. The decorative board according to claim 1, characterized in that an acrylic-polyisocyanate resin is blended with at least one of a polyethylene resin differential powder, a silicone resin, and a vinyl chloride copolymer resin. Production method. 3. Using a colored powder such as pigment powder or colored resin powder suspended in a solvent as the wiping coating paint, apply this paint to the entire surface of the vinyl chloride film,
3. The method for manufacturing a decorative board according to claim 1, wherein after drying, wiping coating is applied by scattering colored powder on the curved portion using a mechanical puff.