JP2008073979A - Melamine decorative plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a melamine decorative plate having a depth feeling. <P>SOLUTION: The melamine decorative plate is formed by impregnating a white fibrous substrate with a varnish consisting of a condensate of melamine with formaldehyde loaded with a trihydric or higher polyalkylene glycol polyhydric ether, drying the resultant body to obtain a resin-impregnated core paper, stacking two or more resin-impregnated sheets of core paper, a resin-impregnated pattern paper(s) and a resin-impregnated front-surface paper, and by pressurizing them on heating to form the laminated product. The resin-impregnated pattern paper is sandwiched by resin-impregnated sheets of core paper and formed by heating pressurization. The white fibrous substrate may be e.g. a bleached sulfate pulp paper, a paper employing a white fiber which becomes transparent or translucent when wetted, such as a glass or a vinyl acetal fiber, a tree free paper, a nonwoven cloth or a woven cloth. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a melamine decorative board.

Conventionally, a melamine resin decorative board in which balance paper, resin-impregnated core paper, resin-impregnated pattern paper, resin-impregnated surface paper, and the like are laminated and integrated with heat and pressure is known.
JP2001-1480 JP 2002-212389 A

  However, many cases are laminated on the outermost surface of the resin-impregnated patterned paper or directly below the resin-impregnated surface paper, and the design has no sense of depth.

  The present invention has been studied in view of such a situation, and a white fibrous base material is impregnated with a condensate of melamine and formaldehyde, and a plurality of dried resin-impregnated core papers, a resin-impregnated pattern paper, and a resin-impregnated surface A thermosetting resin decorative board obtained by laminating paper and hot pressing, wherein the resin-impregnated patterned paper is laminated on an intermediate layer of the resin-impregnated core paper It is a decorative board.

  In the melamine resin decorative board of the present invention, the translucent melamine resin invented in JP-A-2001-1480 and JP-A-2002-212389 is used, and the resin-impregnated patterned paper is used as an intermediate layer of the resin-impregnated core paper. Since they are laminated, the transparency is improved and the depth of the decorative layer is obtained. Further, when the melamine resin decorative board of the present invention is exposed to light, there is an effect that the color of the pattern paper laminated inside rises on the surface as compared with the normal color.

  The present invention will be described in detail below.

  The condensate of melamine and formaldehyde is blended with a molar ratio of formaldehyde / melamine of 1.0 or more and heated to a temperature of 80 to 100 ° C. under a weak alkali to advance a methylolation reaction, and then condensed to give a predetermined product. After reaching the reaction level, the reaction resin solution is obtained by neutralization and cooling. Although melamine can be used alone, it can be co-condensed with acetoguanamine, benzoguanamine, cyclohexaneguanamine, urea, and the like, and can be applied to modified resins such as paratoluenesulfonamide and caprolactam.

  The above condensate is preferably blended with a polyalkylene glycol polyvalent ether having a valence of 3 or more in a range of 5 to 40 parts by weight based on 100 parts by weight of the solid content of the condensate. When the blending ratio is less than 5 parts by weight, the modifier cannot be sufficiently separated and dispersed in the resin, and the desired translucency cannot be obtained. On the other hand, if the blending ratio exceeds 40 parts by weight, not only the physical properties such as water resistance and heat resistance are lowered, but also problems such as unevenness in design occur, which is not preferable.

  Specific examples of the trivalent or higher polyalkylene glycol polyvalent ether include polyethylene glycol glyceryl ether, polypropylene glycol glyceryl ether, polybutylene glycol glyceryl ether, poly (ethylene glycol-propylene glycol) glyceryl ether, poly (propylene glycol tetra Methylene glycol) glyceryl ether, polyethylene glycol pentaerythritol ether, polypropylene glycol pentaerythritol ether, polybutylene glycol pentaerythritol ether, poly (ethylene glycol-propylene xericol) pentaerythritol ether, and the like.

The resin-impregnated core paper is obtained by impregnating a white fibrous base material with a varnish obtained by adding a trialkyl or higher polyalkylene glycol polyvalent ether to the condensate, and drying the resulting white fibrous base material. For example, bleached kraft pulp paper, paper that uses white fibers that become transparent or translucent when glass fiber, vinylon fiber, etc. become wet, mixed paper, non-woven fabric, woven fabric, etc. A material can be applied and the basis weight may be about 100 to 200 g / m ² .

  As the resin-impregnated pattern paper and the resin-impregnated surface paper, a decorative paper for a decorative board and a surface paper impregnated with the same condensate and dried can be applied.

In the melamine resin decorative board of the present invention, a resin-impregnated pattern paper is interposed between a plurality of resin-impregnated core papers, and the resin-impregnated surface paper is arranged on the surface and laminated, and the temperature is 120 to 160 ° C. and the pressure is 40 to 70 kg. / Cm < ² >, and obtained by pressing under hot pressure conditions for 30 to 60 minutes.

In a flask equipped with a stirrer, thermometer and cooling condenser, 0.4 mol of cyclohexaneguanamine (hereinafter referred to as CHG), 1.2 mol of 37% formalin aqueous solution (formaldehyde conversion), 1.2 mol of 46% alcoholic formalin (formaldehyde conversion) Methanol 44%, formaldehyde 46%) was added, and the reaction solution was adjusted to pH 9.0 with sodium hydroxide. The reaction solution was heated, and 0.6 mol of melamine was added after CHG was dissolved. After confirming that melamine was dissolved in the reaction solution, methanol was added so that the solid content was 60%, and acetic acid was added. After preparing and reacting at 80 ° C. for 1 hour under acidic conditions of pH 5.4, the mixture was neutralized to pH 7.0 with sodium hydroxide and cooled to obtain an alcohol-modified CHG-melamine cocondensation resin. 5 parts by weight of polypropylene glyceryl ether having an average molecular weight of 1000 and a hydroxyl value of 161 is added to 100 parts by weight of the solid content of the co-condensation resin, and 1 part by weight of paratoluenesulfonic acid is added as a curing agent to give a colorless transparent varnish. Obtained. Next, the impregnated kraft with a basis weight of 200 g / m ² was impregnated with a resin impregnation ratio of 60% and a volatile content of 7% and dried to obtain a resin-impregnated core paper.

As a decorative layer, patterned paper with a basis weight of 80 g / m ² is impregnated with a modified resin at a resin impregnation rate of 80% and dried, and the resin impregnated pattern paper with a basis weight of 40 g / m ^{2 as} a surface layer is impregnated with resin. The modified resin was impregnated at a rate of 300% and dried to obtain a resin-impregnated surface paper.

In order from the bottom, two sheets of resin-impregnated core paper, one sheet of resin-impregnated pattern paper, two sheets of resin-impregnated core paper, and one sheet of resin-impregnated surface paper are laminated, and heat at 128 ° C.-70 kg / cm ² -120 minutes The melamine resin decorative board having a thickness of 1.0 mm was obtained by molding under pressure condition.

  In Example 1, 40 parts by weight of polypropylene glycol glyceryl ether having an average molecular weight of 1000 and a hydroxyl value of 161 with respect to 100 parts by weight of the solid content of the co-condensation resin was added, and 1 part by weight of paratoluenesulfonic acid was added as a curing agent. This was carried out in the same manner except that a resin-impregnated core paper was obtained after impregnation and drying.

Comparative Example 1
The same procedure as in Example 1 was carried out except that a resin paper impregnated with polypropylene glycol glyceryl ether was impregnated and dried to use a resin-impregnated core paper.

Comparative Example 2
In Example 1, 3 parts by weight of polypropylene glycol glyceryl ether having an average molecular weight of 1000 and a hydroxyl value of 161 with respect to 100 parts by weight of the solid content of the co-condensation resin was added, and 1 part by weight of paratoluenesulfonic acid was added as a curing agent. This was carried out in the same manner except that a resin-impregnated core paper was obtained after impregnation and drying.

Comparative Example 3
In Example 1, 45 parts by weight of polypropylene glycol glyceryl ether having an average molecular weight of 1000 and a hydroxyl value of 161 with respect to 100 parts by weight of the solid content of the co-condensation resin was added, and 1 part by weight of paratoluenesulfonic acid was added as a curing agent. This was carried out in the same manner except that a resin-impregnated core paper was obtained after impregnation and drying.

Comparative Example 4
In Example 1, the lamination configuration was carried out in the same manner except that four resin-impregnated core papers, one resin-impregnated pattern paper, and one resin-impregnated surface paper were laminated and molded in order from the bottom.

  The evaluation results are shown in Table 1.

(Test method)
Depth of design; water resistance with ◯ indicating that the color has a sense of depth when visually checking the surface appearance; x indicating that there is no depth; according to the boiling resistance test method of JIS K 6902 “Thermosetting resin decorative board” Heat resistance when the surface appearance after the test was blistered with x, and when the blister did not occur was marked with ○; the heat resistance test method of JIS K 6902 “Thermosetting resin decorative board” The surface appearance after the test was marked with x when the swelling occurred, and the mark when the swelling did not occur with ○.

FIG. 3 is a structural cross-sectional view of a melamine resin decorative board of Example 1.

Explanation of symbols

1 resin-impregnated surface paper layer 2 resin-impregnated decorative paper layer 3 resin-impregnated core paper layer 6 melamine resin decorative board

Claims (2)

Heat obtained by impregnating a white fibrous base material with a condensate of melamine and formaldehyde, laminating a plurality of dried resin-impregnated core paper, resin-impregnated pattern paper, and resin-impregnated surface paper, and hot pressing A melamine resin decorative board, which is a curable resin decorative board, wherein the resin-impregnated patterned paper is laminated on an intermediate layer of the resin-impregnated core paper. The melamine resin decorative board according to claim 1, wherein a polyalkylene glycol polyvalent ether having a valence of 3 or more is added to the condensate.

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