JPH01283141A - Decorative sheet - Google Patents

Abstract

PURPOSE:To improve the water-proof and heat-proof properties, by laminating a paper impregnated with melamine resin onto a forming sheet obtained through impregnation of a porous base material with modified phenol resin, thereby to have a specific weight increasing rate by boiling and a specific thickness increasing rate by boiling, so that a bank temperature at the time of heating is specified. CONSTITUTION:A forming sheet is obtained in such manner that a porous base material is impregnated with modified phenol resin in which resol-type phenol resin is mixed with polyoxyethylene polyoxypropyrene block polymer. A melamine resin impregnated paper is laminated onto the forming sheet, thereby to obtain a decorative sheet. The decorative sheet has the weight increasing rate by boiling of 9.5-8.5%, thickness increasing rate by boiling of 10-12% and bank temperature of not lower than 200 deg.C, according to the evaluation method JISK 6902. For the porous base material of the decorative sheet, a porous paper, non-woven fabric, cloth or the like is employed which is made of natural fibers singly such as alpha-cellulose, linter etc. or fibrous material having synthetic fibers such as vinylon, nylon etc. or inorganic fibers such as glass etc. mixed in the natural fibers.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to decorative laminates used for building components, furniture components, and the like.

Conventional technology〉 The surface layer is made of melamine resin and the core layer is made of phenolic resin.It has a variety of applications due to its excellent surface performance.
C. It is used. The decorative board is subjected to rounding modification to improve the resin flow of the phenolic resin used in the core layer. This is because if the resin flow is poor, the resin ratio in the core layer will be uneven, resulting in punctures during molding and post-forming, interlayer peeling due to W defects, or warping of the molded product. On the other hand, those modified with hydrophilic modifiers to improve resin flow have inferior water resistance and hot water resistance, and are used in water-related equipment such as Nakatsuchi 7.
Problems such as swelling from the end remained.

<Purpose of the Invention> The present invention was made as a result of studies in view of the above circumstances, and provides a decorative board having a core layer uniformly molded from a phenolic resin with good mold resistance and having excellent water resistance and heat resistance. <Disclosure of the Invention> The gist of the present invention is as described above, and will be explained in detail below. The polyoxyethylene polyoxypropylene block polymer according to the present invention is made by adding ethylene oxide to propylene oxide, and the composition ratio of polyoxyethylene/oxide is 5 to 5.
5096 with a molecular weight of 3000 or less.

Those with a molecular weight of 3,000 or more are not suitable for rounding as they impair penetration into base materials such as kraft paper. Furthermore, if the composition ratio of ethylene oxide is 50% or more, the water resistance of the decorative board decreases and foaming occurs during impregnation, which is undesirable.

Phenol (m) Resol type with a molar ratio of formaldehyde to phenol of 0.8 to 2.0, preferably a gel time of 1 to 5 m1n/block storm combination addition rate of 2 to 30 m to resin content. . 2
If it is less than 30%, no modification effect will be obtained, and if it is more than 30%, hot water resistance and heat resistance will decrease, which is not preferable.

The base material for impregnation of the decorative material of the present invention is made from natural fibers such as alpha cellulose and linters alone, or mixed with synthetic fibers such as vinylon and nylon, inorganic fibers such as glass, etc. Porous paper, non-woven fabric, cloth, etc. are used.

The phenol resin modified as described above is impregnated with 40 to 70% of the weight of the base material, and is finished into a sheet for molding. If the impregnation rate is less than 40%, the moldability will be poor and it will cause delamination, and if it is more than 70%, the loss of resin flowing out will be severe, which is not preferable.

A plurality of molding sheets are laminated, or melamine resin-impregnated paper is layered thereon and hot-press molded to form a laminate or decorative board.

Next, examples and comparative examples will be explained.

Examples 1 and 2 Resin bento 920 for resol type unmodified phenolic resin with a molar ratio of formalin to phenol of 1.5
%, Pluronic L31 (polyoxyethylene polyoxypropylene block polymer manufactured by Asahi Denka, average molecular weight 111
00, modified phenolic resin (11 and Pluronic L 62 (1 m
l, average molecular weight 2000, ethylene oxide composition 20
A modified phenol resin (2) to which %) was added with acetic acid was prepared.

This was impregnated into kraft paper at a resin rate of 50 g to obtain impregnated paper (4) and CB) for molding. 8 each of the impregnated paper and @
Laminated plates (a) and (b) were created by stacking them and hot-pressing them. In addition, on top of each of the impregnated paper sheets and (1) 3 sheets each, printed paper impregnated with 1k of melamine wood was layered and hot-press molded to a thickness of 0.8.
I created a decorative board for a parrot (Q and 0).

Resin fluidity when molding the laminate (a) and (mouth);
The boiling weight increase rate, boiling thickness increase rate, heat resistance, and bending formability of the decorative boards (Q and 0) are as shown in the table.

Comparative Examples 1 and 2 The unmodified phenol resin used in Examples 1 and 2 and the edible phenol resin in which 20% of paratoluenesulfonamide (PTSA) was added to the unmodified phenol resin were used in the examples. The same kraft paper was impregnated with resin at a rate of 50% to obtain modified paper (G) and (2). 8 sheets each of the impregnated paper (■ and pile) were formed by thermo-pressure molding to form a laminate (／→
and ) were created.

In addition, the same decorative paper as in the example was layered on three sheets each of the impregnated paper (G) and ω), and hot-press molded to form a decorative board with a thickness of 0.8 Ω.
and G() were created.

Characteristic values such as the resin fluidity and the presence or absence of punctures during molding of the laminates e'1 and 2), the boiling % weight increase rate and the boiling thickness increase rate of the decorative laminates (Q and 0) are It was as shown in the table.

Table evaluation method (1) Cut out as many specimens of a certain shape (120x120w square) as possible from resin fluidity-impregnated paper and stack 8 sheets at 140°C.

The weight of the test piece when molding a laminate by hot pressing at 100 kg/i for 15 minutes and the weight of the laminate excluding the flowed resin are determined, and the resin fluidity is calculated from the following formula.

Test piece weight - Layer weight Resin fluidity (slow) = X
100 test pieces (2) After being placed in a thermostat with a boiling layer thickness increase rate and a boiling thickness increase rate for 24 ± 1 hours, the pieces were allowed to cool to room temperature in a desiccator (B) Next, Weigh the strength of the test piece to the nearest 1 mg, and measure the thickness to the nearest 0.01 s + s at measurement points approximately 500 mm inside the center of each of the four peripheries using an outside micrometer.

e→ Put distilled water in a beaker, heat it with an appropriate heat source, bring it to a boil, and then completely immerse the test piece in it. 0 The test piece and the test piece or the test piece and the container do not come into close contact. do it like this.

After boiling for 2 hours ± 5 minutes, take out the test piece and leave it at room temperature (2
0±5°C) and cooled in a round lid of distilled water for about 15 minutes.

b) Remove from the water and wipe off any moisture adhering to the test piece with clean gauze or filter paper.

Measure the test piece to 1 mg' within 1 minute 7. Measure the thickness of the test piece at the same measurement point as before to 0.01 ± 1 hour. Take it out and let it come to room temperature in a desiccator. Leave to cool until 〇(f) Visually inspect the test piece to see if there is any interlayer delamination.

The weight increase rate W (@ and the thickness increase rate D (%) of the sample are:
Each test piece is expressed as the average value of three values calculated using the following formula.

Wl-Wl Dt-D.

Here, W: Weight increase rate of each test piece (%) D: Thickness increase rate of each test piece (Wo: Weight of test piece before test (g) Wl: Weight of test piece after test (g) Do = Thickness of the test piece before the test (T) Dl: Thickness of the test piece after the test (ACG+) (3) Puncture temperature during heating Melt the surface of the decorative board in a bath at a predetermined temperature After applying a temperature-indicating paint, it was heated with a far-infrared heater and the surface temperature at the time of puncture was measured.

(4) Bending formability Using the bending device shown in Figure 1 according to the JIS K6902 method, draw several lines of powder on the back side with a thermometer crayon and heat to each heating temperature. Place them so that they touch each other, leave them in a wholesaler for 1 minute, let them cool, then take them out and visually inspect the surface to see if there are any blisters, cracks, or peeling, and if they are molded according to the mold.

(Effects of the Invention) The laminates and decorative laminates of the present invention use amorphous phenolic resin or modified phenolic resin by conventional methods, and have better resin fluidity, increased rate of increase in I amount during boiling, Thickness increase rate, heat resistance, and moldability have been significantly improved, and higher quality products can be obtained than before.Furthermore, in order to obtain these characteristics, it was necessary to maintain a high resin impregnation rate. The laminates and decorative laminates of the present invention do not require such a battle and can be made with a low resin content, resulting in lower costs.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a bending and forming device (1). 1...Bent gmagt 2...Female type 3...Male 4...Spring patent applicant Aikani Gyo Co., Ltd.

Claims (1)

[Claims] (1) A melamine resin-impregnated paper is laminated on a molding sheet made of a porous base material impregnated with a modified phenolic resin, which is a resol type phenolic resin mixed with a polyoxyethylene polyoxypropylene block polymer. The molded product has a boiling weight increase rate of 9.5 to 8.5%, a boiling thickness increase rate of 10 to 12%, and a puncture temperature of 20% when heated, according to the JIS K6902 evaluation method.
Decorative board characterized by a temperature of 0°C or higher