JPH0229334A - Manufacture of melamine decorative laminate sheet having three dimensional appearance - Google Patents

Abstract

PURPOSE:To manufacture a decorative laminate sheet having stabilized three dimensional feeling by combining an acid substance, of an alkali substance, and hydrated inorganic salt with printing ink. CONSTITUTION:Patterns are printed with printing ink containing an acid substance, or an alkali substance, and hydrated inorganic salt on a piece of printing paper, and then a piece of impregnated paper is manufactured by applying melamine resin onto the whole surface of the printing paper and drying. Then the impregnated paper is overlapped with a molding base, over which, if necessary, further a piece of overlay impregnated paper impregnated with melamine is placed, and a mirror plate is placed on the laminated material, heated and pressurized. If necessary, recesses and projections or polish variation to synchronize with pattern sections are provided by cooling. As for the acid substance or alkali substance, free acid or alkali, a substance representing acid or alkali by dissociation, decomposition or reaction by means of heat can be used. As hydrated inorganic salt, calcium chloride dihydrate, aluminum sulfate octadecahydrate sodium phosphate dodecahydrate, sodium sulfate decahydrate or the like can be used.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a melamine-based decorative board with a three-dimensional effect that has irregularities or gloss changes in synchronization with a pattern on the surface.

The melamine decorative board with a three-dimensional effect obtained by the method of the present invention can be used for various purposes, such as doors, wall materials, flooring materials, furniture,
It can be used for kitchen related purposes.

[Prior art]

Regarding the manufacturing method of melamine-based decorative boards with a three-dimensional effect by hot-press molding, for example, Japanese Patent Publication No. 56-4405, Japanese Patent Publication No. 60-34464, and Japanese Patent Publication No. 60-54866.
It is described in Japanese Patent Publication No. 63-234 and the like.

However, in any of these methods, it has been difficult to put them into practical use because they lack stability in expressing the intended three-dimensional effect.

[Problem to be solved by the invention]

In order to produce a melamine-based decorative board with a three-dimensional effect, the basic method is to add an acidic or alkaline substance to the pattern ink that changes the curing speed of the melamine-based resin.

However, simply adding an acidic or alkaline substance to the ink results in poor stability in the expression of three-dimensional effect.

As a result of extensive research, it was discovered that a cosmetic surface with a stable three-dimensional effect can be obtained by combining an acidic or alkaline substance with a hydrated inorganic salt, leading to the present invention. .

[Failure to solve the problem]

The present invention is a method for producing a melamine-based decorative board with a three-dimensional effect, in which a pattern is applied to the printing paper using printing/ink containing an acidic or alkaline substance and a hydrated inorganic salt, and then the entire surface of the printing paper is printed. Impregnated paper is produced by impregnating and drying melamine resin, and then this impregnated paper 1 is superimposed on a molding base material, and if necessary, the overlay impregnated paper further impregnated with melamine resin is transferred to device j2, and the laminated material is By placing a mirrored plate on top and applying heat and pressure, and cooling further if necessary, the unevenness or 2.
It is characterized by imparting change.

The melamine resin used in the present invention is one whose main components are melamine and formalin, and if necessary, urea, acetoguanamine, benzoguanamine, etc. are added as a modified resin.

As the printing paper, there are used papers such as titanium paper, thin paper, and kraft paper, cloths such as cotton cloth and glass cloth, and nonwoven fabrics, but there are no particular limitations thereon.

The printing ink structure contains acidic or alkaline substances, hydrated inorganic salts, pigments, vehicle resins, and the like.

The acidic substance or alkaline substance may be a free acid or alkali, or may be a substance that dissociates, decomposes, or reacts with heat and exhibits acidity or alkalinity.

(Polymer Processing, February 977 issue, pp. 4-9) Examples of acidic substances include acetic acid, formic acid, ammonium chloride, ammonium chloride, ammonium acetate, aniline hydrochloride 1, sulfamic acid, imidodisulfonic acid, 2- Amino-2-methylpropanol hydrochloride, para-toluenesulfonic acid, etc. alone or in mixtures can be used. Alkaline substances include, for example, sodium hydroxide, calcium hydroxide, barium hydroxide, sodium carbonate, tricalcium phosphate, metal alcoholade, borax, monoethanolamine, triethanolamine, ethylenediamine, guanidine carbonate, melamine, etc. alone or in mixtures. It is. The amount of the acidic substance or alkaline substance added to -a is preferably 0.1 to 20% by weight, particularly 1 to 144%.

Examples of hydrated inorganic salts include calcium chloride dihydrate, aluminum sulfate decahydrate, sodium phosphate decahydrate, sodium sulfate decahydrate, etc., and the amount added is generally 0.
．． 1 to 20% by weight, especially 1 to 10% by weight is desirable.

Vehicle resins include unsaturated polyester resins, melamine resins, acrylic modified varnishes, nitrocellulose resins, cellulose acetate resins, salt vinyl acetate/acrylic copolymers, etc. Fluororesin, silicone resin, etc. that have release properties may be added to the resin (Japanese Patent Publication No. 59-29436).
(see publication).

For the impregnation treatment with the melamine resin, a method used in the production of ordinary melamine resin-impregnated paper can be used as appropriate. The adhesion rate of melamine resin is 50. = 1
50%, preferably 80-100%.

Examples of the base material for molding include plywood, particle board, flexible board, calcium silicate board, pulp cement board, resin-impregnated core paper for lamination, and the like.

During heat and pressure molding, mirror-finished metal plates such as duralumin plates and stainless steel plates, and plastic films such as polypropylene, polyethylene terephthalate, and vinylon can be used as forming plates or films, and the surface finish ranges from glossy to matte. can be used.

As for heating and pressurizing conditions, the ripening temperature is 120 to 170°.
The C1 pressure is 5 to 100 kg/e-, and is determined as appropriate depending on the molding base material.

A decorative surface having irregularities that match the pattern is obtained by the incompletely hardened resin in the pattern portion adhering to the mirror plate when the pressure is released.

In addition, the decorative surface, which has two changes in synchrony with the pattern, does not allow the resin in the pattern to adhere to the mirror plate even after the pressure is released, and allows for fine differences in surface condition due to slow curing speed and optical effects of the resin. Obtained by difference.

This is determined by the ink structure and molding conditions.

The present invention will be explained below with reference to Examples.

Example 1 A stone grain tall was gravure printed on 80 g/rd titanium paper using the following ink composition.

Ink composition Acrylic modified varnish 13 parts by weight Sodium carbonate 5 Sodium sulfate decahydrate 5 Pigment
10〃Toluene 30〃Xylene 37〃The printing paper at 120℃
After drying for 1 minute, the solid content is 90g with the following resin mixture.
/n(, impregnated and dried with a volatile content of 6.5%.

Resin compounding liquid Polyfix PM-132 100 parts by weight (manufactured by Showa Kobunshi ■) Kitanit A (manufactured by Nitto Riken Kogyo ■) 0.4' Hibar 1440 (manufactured by Middle East Oil ■) 0.12〃Toxieloo〇 (manufactured by Tokuyama Soda ■) 5I Water
20 Next, four sheets of 150 g/nf impregnated kraft paper impregnated with phenolic resin were used as a molding base material. Place the base material on the female template, and apply the impregnation layer 1 on top of the base material.
, A glossy chrome plating mirror plate with a thickness of 2+am was placed on the surface, and the molding temperature was 1411' C1 molding pressure cuff 0 kg.
/d for 20 minutes. After cooling with water for 20 minutes and releasing the pressure, a decorative board with a three-dimensional stone grain pattern with a cape finish on the patterned area was obtained.

Example 2 The same operations as in Example 1 were carried out except that the ink composition was changed to the following, to obtain a decorative board with a three-dimensional pebble pattern with a matte finish on the pattern part.

Ink composition Cellose acetate 30 parts by weight Kitanishito A 15 Coloring pigment
5 #Extender pigment
1.0 #Sodium sulfate decahydrate 1
0 = MEK 15
#Methanol 15 l Example 3 A wood grain pattern was gravure printed on 80 g/nf titanium paper using the following ink composition.

Ink composition Acrylic modified varnish 8 parts by weight Silicone resin 5 #Carbonate I/Rium
10 Sodium sulfate decahydrate
5 pigment 10# toluene 30II xylene
32# After drying the printing paper at 120''C for 1 minute, the solid content was reduced to 90g/rr with the following resin mixture.
f. Impregnated with 6.5% volatile content and dried.

Resin compound liquid Santotsubu Kawa-700 (manufactured by Nissan Kagakuhata) 100 Hardening agent HA-1 () 0.1 1l HA-2 () O105 Permeability agent HA-70 () 1.3 Then, a plate with a thickness of 15 m The impregnated paper was placed on a particle board with the ink side facing up. The laminate was placed in a press equipped with a stainless steel mirror plate polished to semi-gloss, and pressed for 5 minutes at a molding temperature of 145°C and a molding pressure of 10 kg/C-. When the molded product was taken out after pressing, the resin in the patterned area adhered to the mirror plate and was removed, resulting in a decorative board with unevenness giving a three-dimensional effect.

In addition, in Examples 1 to 3, in which ink without adding sodium sulfate decahydrate was used and the same operations were performed in other respects, almost no change in the decorative surface of the pattern was observed.

〔Effect of the invention〕

The melamine-based decorative board of the present invention has a stable three-dimensional effect by combining an acidic or alkaline substance with a hydrated inorganic salt in the ink composition. Depending on the conditions, it is possible to provide not only unevenness but also two changes, so it is expected to be applied to a wide range of applications.

Patent applicant: Fuji Polymer Co., Ltd.

Claims (1)

[Claims] After applying a pattern on printing paper using printing ink containing an acidic or alkaline substance and a hydrated inorganic salt, the entire surface of the printing paper is impregnated with melamine resin and dried to produce impregnated paper. Layer the impregnated paper with the molding base material,
If necessary, an overlay impregnated paper impregnated with melamine resin is further placed, and a mirror plate is placed on top of the laminated material, heated and pressurized, and if necessary, further cooling is performed to create unevenness or convexity that matches the pattern area. A method for producing a melamine-based decorative board with a three-dimensional effect, which is characterized by imparting a change in gloss.