JPS6322980B2 - - Google Patents

Description

[Detailed description of the invention]

When the surface decorative layer is a thermosetting resin decorative board such as melamine resin, diallyl phthalate resin, polyester resin, or epoxy resin, the surface decorative paper has a particle size.
By using cardboard made from a mixture of 10 to 50 micron mica powder and multiple pigments, it produces silver, gold, copper, and other metallic effects.
The objective is to obtain a product that has a deep appearance and has performance equivalent to that of ordinary thermosetting resin decorative laminates. In general, the characteristic of thermosetting resin decorative boards is that their surfaces have beautiful colors or designs.
This is applied by the decorative cardboard used for the decorative layer. In order to obtain the decorative layer, monochromatic decorative paper containing titanium oxide and various pigments may be used, or titanium oxide and other pigments may be added to provide shielding properties, and the surface may be coated with wood grain patterns or abstract patterns. It is customary to use patterned decorative paper (30 to 150 g/m ² ) that is printed with. The above-mentioned decorative paper is coated with or impregnated with a thermosetting resin such as melamine resin, diallyl phthalate resin, polyester resin, and epoxy resin in a resin amount (solid content) of 30 to 70% to obtain the impregnated decorative paper 1.
get. On the other hand, a plurality of sheets 2 of impregnated core paper 2 prepared by coating and impregnating phenol resin or diallyl phthalate resin on kraft paper having a basis weight of 30 to 250 g/m ² are stacked in a configuration as shown in FIG. 1.
These are heated and pressed at 80-180℃ and 50-150Kg/cm ²
The usual method is to heat and pressurize under the following conditions. Various decorative cardboards are used for such thermosetting resin decorative boards. In other words, a so-called pearl ink, which is a blend of shellfish powder and a plurality of pigments, is printed solidly on a base cardboard for cosmetics, and then impregnated with resin as described above to create a metallic-like decorative board, or aluminum powder and copper are used. It is possible to use cardboard for decorative boards into which metal powder such as powder has been added in the same manner as described above. However, products using metal powder have the disadvantage that after being made into decorative laminates, they suffer from discoloration due to oxidation and poor chemical and solvent resistance, and cannot maintain the performance as thermosetting resin decorative laminates. Furthermore, decorative paper coated with metal powder can also be used in the same manner as described above. Thermosetting resin decorative boards using such decorative paper have a metallic appearance such as silver powder color or copper powder color, but they are flat and cannot produce a deep metallic feel. In addition, in terms of performance, due to insufficient resin impregnation, there is a drawback that interlayer peeling occurs in heat resistance and boiling resistance tests. Unlike the above-mentioned decorative cardboard that is generally used, the thermosetting resin decorative board according to the present application has a grain size of 10
The paper is made by mixing ~50μ mica powder and multiple pigments and is used for cosmetic cardboard. The chemical structure of the mica powder used is
(Si, Al) ₈ O ₂₀ , X=Ca, Y=Al, Fe, Li, Mg
It is a fine powder of the above particle size consisting of. If the particle size of the mica powder used in this application is reduced to 9 microns or less, the desired luster and metallic feel will be lost. On the other hand, when the particle size is increased to 51μ or more, when coating and impregnating thermosetting resins such as melamine resin and diallyl phthalate resin in the process of producing decorative laminates, mica powder may fall off from the surface layer or cause uneven streaks. This results in the appearance of the decorative board being damaged. In order to avoid such defects and obtain a metallic appearance, it is desirable to use decorative paper using mica powder with an optimum particle size (10 to 50 microns). Further details of the metallic pigment used in the present application are as follows. In the case of silver-based pigments, blue, black, and yellow pigments are mixed with the mica powder. In the case of copper, the mica powder is mixed with red and brown pigments to adjust the color. Next, examples of the present invention will be shown. Example 1 Mica powder (25-35 μ) and blue, black, and yellow pigments were mixed, and a melamine resin produced by a conventional method was applied to a cosmetic base paper with a weight of 100 g/m ² . Impregnated paper (1 sheet) and unbleached kraft paper (200 g/m ² ) coated with phenolic resin produced by a conventional method and impregnated core paper (4 sheets) are stacked as shown in Figure 1. and set the shiny mirror plate on the melamine resin impregnated layer.
After heating for 40 minutes at 150°C and 100Kg/cm ² , it is cooled to near room temperature under pressure, and removed after depressurizing. The melamine resin decorative board obtained by this method can be finished with a distinctive appearance that has a metallic feel and has excellent three-dimensional depth, and can achieve a finish that cannot be achieved with conventional metallic decorative boards. That's what I got. On the other hand, as shown in Table 1, the general performance as a thermosetting resin decorative board is no different from products using ordinary decorative base paper. Example 2 Cosmetic base paper made by mixing mica powder (20 to 40μ) and yellow, red, and brown pigments and making 100g of paper per square meter
The impregnated decorative paper 3 coated and impregnated with diallyl phthalate resin produced by a conventional method on a ² m2 paper was stacked and placed on a 5 mm thick calcium silicate plate 4 as shown in Fig. 3, and suspended between press heating plates. Set it in contact with the lowered mirror plate and press-form it. The molding conditions were a heating platen temperature of 130℃ and a pressure of 15Kg/ ^cm2 .
Heat and pressurize for a minute, then remove the pressure after removing it at the same temperature. The diallyl phthalate resin noncombustible decorative board obtained by this method has a metallic feel as in Example 1, and can be finished with a distinctive appearance with three-dimensional depth and excellent design. As for the general performance as a decorative board, as shown in Table 2, it has the quality of a diallyl phthalate resin decorative board using ordinary decorative base paper.

【table】

【table】

【table】 [Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing an example of the structure of a thermosetting resin decorative board of the present invention, and FIG. 2 is a vertical cross-sectional view of a decorative board in which the components shown in FIG. 1 are integrated by heat-pressing. be. FIG. 3 is a vertical cross-sectional view showing the structure of a thermosetting noncombustible decorative board, and FIG. 4 is a vertical cross-sectional view of a decorative board in which the components shown in FIG. 3 are integrated by hot-pressing.

Claims (1)

[Claims] 1. In a thermosetting resin decorative board in which a decorative cardboard is coated or impregnated with a thermosetting resin such as melamine resin, diallyl phthalate resin, polyester resin, or epoxy resin, the surface decorative layer has a particle size of 10 to 50μ. A thermosetting resin decorative board characterized by having a metallic feel and a deep appearance by using base paper made by mixing mica powder and a plurality of pigments.