JPS5854984B2 - Decorative board manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a compound having an amino group on a triazine ring,
It relates to a method of obtaining a decorative board with good surface abrasion resistance by adding and mixing fine glass and silica to a condensed resin solution with a formaldehyde methanol solution, impregnating it, and heating and pressurizing it. A condensation resin solution of 2.0 to 4.0 moles of formaldehyde in a formaldehyde methanol solution to 1 mole of a compound having an amino group is added with 0.5 to 40% by weight of fine glass and 0% silica based on the solid content of the resin. The present invention relates to a method for obtaining a decorative laminate with good surface wear resistance by adding and mixing .

Conventional decorative boards made of condensed resins of formaldehyde and compounds with amino groups in the triazine ring generally have high surface hardness and are used for horizontal surfaces such as tables, counters, and desks. Performance is surface abrasion resistance.

There are two ways to increase the surface abrasion resistance: one is to cover the surface with so-called overlay impregnated paper and press it to create a resin film on the surface of the decorative board, and the other is to coat the surface with so-called overlay impregnated paper and press it to create a resin film on the surface of the decorative board. There are two methods of improving wear resistance by adding and mixing a certain amount of a lubricant such as a lubricant.

The resin liquid specified in the present invention is a condensation resin liquid made of a compound having an amino group on the triazine ring and a formaldehyde methanol solution. It has the following characteristics compared to a condensation resin liquid with a compound having .

Since this resin has been etherified, it has good crack resistance in molded products.

It also has good flow properties during heat and pressure molding, especially for 10kg
Effective when pressurized below /ffl.

As mentioned above, there are two methods for improving the surface abrasion resistance of the decorative board using this resin liquid.

One of them, the method of using overlay paper, certainly improves the surface abrasion resistance.

However, this overlay paper has a basis weight of 25 to 5
It is thin and difficult to handle at 09/m.

Furthermore, when it becomes an impregnated paper, it becomes even more difficult to handle, and at the stage up to pressing, the yield is the lowest among the laminated papers.

Furthermore, from the point of view of cost, the use of overlay paper is not preferable.

Another method of increasing surface abrasion resistance is to add a lubricant to a resin liquid, in which a known lubricant is added to a condensed resin liquid of a formaldehyde aqueous solution and a compound having an amino group on the triazine ring. When impregnated and pressed, a product with good appearance and wear resistance can be obtained.

Therefore, when we added it to the patterning resin liquid specified in the present invention and impregnated it with press, we found that there were two types: one with good appearance and one with poor appearance where the anti-friction agent could be seen with the naked eye and whitening etc. was completed.

Therefore, when the abrasion resistance of the products with good appearance was examined based on JIS-6902, there was no significant difference from the product without any anti-friction additives, and no improvement was observed.

The present invention provides a condensation resin liquid of a compound having an amine group on the triazine ring and a formaldehyde methanol solution,
The present invention provides a formulation of an anti-friction agent that has good compatibility, good surface appearance after pressing, and high wear resistance.

The condensation resin liquid used in the present invention is prepared by adding 2.0 to 4.0 moles of a methanol solution containing 46% formaldehyde to 1 mole of a compound having an amine group on the triazine ring, such as melamine, acetoguanamine, or benzoguanamine. Adjust pH to 5.5 to 6.9, 76 to 85
It is produced by conducting a reaction at ℃ for 1 to 2 hours, but the reaction temperature and time may vary depending on the compound having an amino group on the triazine ring, the molar ratio of the compound to formaldehyde in the formaldehyde methanol solution, pH, etc. Needless to say, they are different.

Condensed resin liquid produced as above (hereinafter referred to as liquid A)
To this, 0.5 to 4.0% by weight of fine glass and 0.5 to 6.0% by weight of silica are added to the solid content of liquid A and thoroughly stirred and mixed in a mixer.

The fine glass preferably has a particle size of about 5 to 45 microns and is highly transparent.

Typical examples of strings are S 10275.0%, Na2
012.5%, Ca07.0%, Mg03.5%, Al
2030.5% and other 0.5%.

The silica has a specific surface area of about 200771"/g, and is preferably produced by an amorphous dry method. Typical compositions include: Sio 299.8%, Al2030
．． It is 1% or less, and Fe203 is 0.1% or less.

If the amount of either fine glass or silica added is less than 0.5% by weight, there will be no effect of improving the surface abrasion resistance of the product.

Also, in the case of micro glass, it is 4.0% by weight, and in the case of silica, it is 6.0% by weight.
If it exceeds 0% by weight, surface appearance defects such as whitening will occur.

The present invention is characterized in that a certain amount of these microscopic glasses and silica are combined in liquid A.

After adding microscopic glass and silica to liquid A and stirring thoroughly, a curing agent, a mold release agent, etc. are further added, and printed patterned paper, titanium paper, cloth, etc. used for decorative boards are impregnated and dried.

In this case, the resin impregnation rate and impregnation drying conditions vary, but preferably the impregnation rate is 70 to 180% (with respect to the object to be impregnated).
, a drying temperature of 50 to 140°C, and a drying time of 2 to 15 minutes.

Further, it is preferable that the resin liquid to be impregnated be kept in a circulating state in order to prevent precipitation of microscopic glasses.

In the production of the decorative board of the present invention, the base material used for lamination is kraft paper or cloth for the decorative board, and thermosetting resin such as phenol resin, melamine resin, urea resin, alkyd resin, unsaturated polyester resin, etc. In addition to impregnated paper impregnated with resin or a mixture thereof and dried, wood base materials such as particle board, hardboard, or plywood, or inorganic base materials such as pulp cement board or asbestos board can be used. .

Further, as a press device, any method such as a batch type or a continuous type can be used, and it may be formed into a single layer sheet or may be laminated with the above-mentioned base material or the like.

The present invention will be specifically explained below using examples.

〔Example〕

1 mole (126 g) of melamine to 3.0 mole (195 g) formaldehyde in methanol solution
The slurry was mixed and adjusted to pH 6.0 with 10% sodium carbonate, and the reaction was carried out by heating and stirring at 75°C in a reaction vessel equipped with a reflux condenser, and the weight ratio of water and methanol was 1:
One drop of the reaction resin is added to the mixed solution in step 1, and when the mixture becomes cloudy, the reaction is stopped and the mixture is cooled.

This time is approximately one and a half hours.

For this resin liquid solid content, micro glass with an average particle size of 10 microns and a specific surface area of 200rr? /g of silica is added according to the formulation shown in the attached table, and stirred and dispersed for 5 minutes using a homomixer.

Next, add 0.4% para-toluenesulfonic acid as a curing agent.
A pattern paper with a basis weight of 80 g/- was impregnated with 0.7% of the release agent and dried at 90° C. for 7 minutes to obtain impregnated paper with an impregnation rate of 130%.

Next, an impregnated paper for the base material was obtained using the resin without the lubricant added thereto, and it was laminated with the impregnated paper.
/cyy was molded using a batch press.

The abrasion resistance of the decorative board obtained in this way was determined according to JIS-690.
The results obtained based on 2 are shown in the table.

As a reference example, the abrasion resistance of decorative laminates containing conventional etherified melamine resins and anti-friction agents is also summarized in the table.

As is clear from the above results, the wear resistance of decorative laminates using a resin liquid with good crack resistance and good flowability during molding can be increased approximately five times, and the surface appearance can also be improved. I was able to obtain a good decorative board.

Furthermore, by omitting the overlay, it is possible to save labor in the manufacturing process and reduce costs, which is useful in practical terms.

Claims (1)

[Claims] 1. For 1 mol of a compound having an amino group on a triazine ring, 0.5 to 4.0 mol of fine glass is added to a condensed resin solution with 2.0 to 4.0 mol of formaldehyde in a methanol solution of formaldehyde, based on the solid content of the resin. Using a resin liquid containing 0% by weight and 0.5 to 6.0% by weight of silica, impregnate the desired pattern paper with the conventional method for thermosetting resin decorative laminates, and apply it in a single layer or in layers. A method for producing a decorative board, characterized by heating and pressure forming.