JPS6034464B2 - Thermosetting resin decorative board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to decorative laminates using thermosetting resin impregnated paper.

Conventionally, a technique is known in which a base paper with good permeability is impregnated with a thermosetting resin and then laminated onto a base paper using a heating and pressure press.

However, the surface of the decorative board produced by this method can be completely glossy or completely matte (the degree of gloss can be selected such as 3-minute gloss, 7-minute gloss, etc.) depending on the type of mirror surface plate used during heating and pressure pressing. ), which was extremely unsatisfactory in terms of design. Therefore, a method of using a mirror plate with an uneven surface was proposed, but there were problems such as the inability to create deep embossing due to the amount of resin, and difficulty in synchronizing with the design, so it was not sufficiently effective. I couldn't. The present invention has been made in order to eliminate these problems, and by creating a glossy part and a matte part that match the design on the surface of the decorative board, giving a visual unevenness to the surface, it is extremely The aim is to manufacture decorative laminates with a high degree of design.

A detailed explanation will be given below with reference to the drawings.

First, as shown in Fig. 1, a pattern made of normal ink 2 is placed on a base paper 1 with good permeability, and an ink 3 whose pH is more acidic than the normal ink (hereinafter referred to as acidic ink) or more than the normal ink. Ink with pH on the alkaline side 4
(hereinafter abbreviated as alkaline ink) is applied to create printing paper.

The combination of inks at this time may be normal ink and acidic ink, normal ink and alkaline ink, or normal ink, acidic ink, and alkaline ink. Next, a thermosetting resin whose curing is accelerated by an acid curing agent, such as a fast-curing melamine resin, is impregnated to prepare impregnated paper.
Next, the impregnated paper is heated and pressed onto a base material 5 such as plywood or particle board using a heat and pressure press machine. At this time, when pressing under normal press conditions using a full-gloss to 5-separation mirror surface disc, the part with normal ink 2 hardens normally and becomes the same gloss 6 as the mirror surface disc, whereas the acidic ink 3
The area with the alkaline ink 4 is slightly over-cured and becomes completely matte 7, and the area with alkaline ink 4 is slightly under-cured and similarly becomes completely matte 7. Therefore, the difference in gloss between No. 6 and No. 7 gives a visually uneven feeling. As the base paper with good permeability, titanium paper, kraft paper, tissue paper, etc. made of sulfide pulp, kraft pulp, etc. can be used, but it is preferable that the pH thereof is as close to neutral as possible.

Generally, printing inks for decorative paper based on fiber derivatives such as nitrocellulose, or synthetic resins such as urethane, acrylic, and vinyl can be used as the ink.

Acidic ink is made by adding 0.01 to 0.01 to acetic acid, formic acid, other organic acids, hydrochloric acid, nitric acid, or other inorganic acids to the above-mentioned normal ink.
The pH is 3.5 to 6.0 when 1% is added, and the alkaline ink is the above-mentioned normal ink with monoethanolamine, ethylenediamine, and other substances with a boiling point of 90 to 200 oo.
Added 0.01 to 1% of organic amine and has a pH of 8.
．． It is 0 to 10.5.

As the acid curing agent, conventionally known ones can be used, but organic sulfamic acid type, imidodisulfonic acid type and other heat latent curing agents are particularly effective.

Thermosetting resins include melamine resin, phenol resin,
Urea resin and others can be used.

The condition of the press surface is determined by VC (Vol
It is known that VC has a large influence on the gloss of the mirror surface, and that it is necessary to regulate VC within the range of 6.5 to 7.0% or 6.0 to 7.0% in order to obtain the same gloss as that of a mirror surface. ing.

VC (%) = Impregnated paper weight - impregnated paper weight after drying X,.

〇Weight of impregnated paper However, as shown in the graph of Figure 2, the VC is 6.5 to 7.
．． In order to set it to 0% or 6.0 to 7.0%, it is necessary to control the pH of the impregnating liquid to a range of 7.9 to 9.2 or 7.5 to 9.2.

Therefore, when impregnating printing paper with a pattern using only Ink 2, the base paper is It is necessary to adjust the pH of the impregnating solution in advance. As the base material, wood boards such as plywood and particle board, fiberboards such as insulation boards, inorganic boards such as asbestos straight boards and pulp cement boards, metal boards, synthetic resin boards, and others can be used.

Gravure printing, letterpress printing, screen printing,
It can be applied by other conventionally known methods, and the design can be a wood grain pattern, an abstract pattern, a geometric pattern, a stone grain pattern, or others. The most suitable method for carrying out heating and pressure pressing is a flat pressure press machine having a heating plate that can be heated by a heat source such as steam or an electric heater, but the method is not limited to this method.

Also, the gloss of the mirror surface to be used should be between full gloss and 5 degrees. The decorative laminate having the above configuration can be manufactured without making any changes to the conventional manufacturing process of thermosetting resin decorative laminates in each of the printing process, impregnation process, and heating and pressurizing process. Its uses are wide-ranging, including furniture materials, cabinet materials, and interior decoration materials.

Example 1 A printing paper was prepared by performing three-color printing on 80% titanium paper using a normal nitrocellulose-based ink and an alkaline ink having the following formulation.

Alkaline ink prescription A quick-curing melamine resin with the following formulation was applied to this printing paper in a resin amount RC* (Resin Content
) was impregnated to 60% to prepare lamin-impregnated paper.

Distance-curing melamine resin prescription RC (%) = Impregnated paper weight weight - weight Base paper Set the disc and set the surface temperature of the mirror disc to 160℃.
When the particle powder was heated and pressed under the conditions of surface temperature of the lower heating plate of the press 16000, pressure 19k9/c, press time 5 and actual sand, the part with normal ink was full gloss, and the part with alkaline ink was Parts are matte,
A thermosetting resin decorative board giving a visually uneven feeling was obtained.

Example 2 80 pm/A printed paper was prepared by performing two-color printing on the same titanium paper using a normal nitrocellulose ink and an acidic ink having the following formulation.

When a decorative board was prepared under the same conditions as in Example 1, the part coated with the normal ink became completely glossy, the part coated with the acidic ink became matte, and a thermosetting resin decorative board giving a visually uneven feeling was obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a diagram showing the relationship between the pH of the impregnating liquid and the VC of the impregnated paper. 1...Base paper, 2...Normal ink, 3...
...Acid ink, 4...Alkaline ink, 5.
... Base material, 6 ... Same glossy part as the mirror surface board, 7 ... Completely matte part. Figure 1 Figure 2

Claims (1)

[Scope of Claims] 1. A thermosetting resin decorative board made by impregnating a base paper with a desired design and good permeability with a thermosetting resin, and pressing the dried impregnated paper onto a base material under heat and pressure. Therefore, the desired pattern can be created using a combination of a normal ink and an ink whose pH is more acidic than the normal ink, or a combination of a normal ink and an ink whose pH is more alkaline than the normal ink. Alternatively, it is applied by using a combination of a normal ink, an ink whose pH is more acidic than the normal ink, and an ink whose pH is more alkaline than the normal ink, and is impregnated into base paper with good permeability. 1. A thermosetting resin decorative board characterized in that the thermosetting resin has a property of being accelerated in curing by an acid curing agent. 2. The thermosetting resin decorative board according to claim 1, wherein the acid curing agent is a heat latent acid curing agent.