JPS5988383A - Manufacture of inorganic dressing board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing an inorganic decorative board used as a building material or the like.

Inorganic decorative boards are made by adhering a wood veneer with decorative properties to an inorganic substrate that serves as the core layer.By combining the two, it improves the aesthetic appearance (cosmetic properties) of the inorganic board and also improves the decorative board's appearance. Efforts are being made to make it nonflammable.

There are those that are equipped with an inorganic substrate that uses all the binder, and those that are equipped with an inorganic substrate (resin concrete board) that uses resin as the binder, but both types have problems in manufacturing or use. In other words, when manufacturing an inorganic decorative board with an inorganic substrate using cement as a binder, after the inorganic substrate is made, a wood decorative board is attached to the inorganic board using adhesive, with gold paper sandwiched between the two. There was a problem in that the plates had to be glued together, which took a very long manufacturing time. If it were possible to bond the decorative wood veneer directly at the same time as the raw materials for the inorganic substrate were formed, the manufacturing time could be shortened, but this was not possible. This is because cement has almost no adhesion ability for decorative wood veneers.
This is because, even if bonding is possible, if the raw material and the decorative wood veneer are brought into contact with each other before the raw material has hardened, the decorative wood veneer will be stained by alkaline content eluted from the cement. The reason why gold paper is sandwiched between the inorganic substrate and the decorative wood veneer is to improve the adhesion between the two and to prevent the decorative wood veneer from being soiled by alkaline content. However, even if gold paper is inserted between the two, there is still a problem in that the contamination of the decorative wood veneer by alkaline content progresses over time.

On the other hand, even in the case of inorganic decorative boards equipped with inorganic substrates using resin as a binder, after the inorganic substrate is manufactured, the wood decorative veneer must be adhered to the inorganic substrate using adhesive each time. There was a problem in that the manufacturing time was long. This is because the proportion of resin in the raw material of the inorganic substrate is usually about 3 to 10% by weight, and the amount of resin is small enough to sufficiently adhere the decorative wood veneer at the same time as the raw material is molded. Furthermore, conventionally, thermosetting resins such as phenolic resins have been used as resins, and it is necessary to apply heat when molding the raw materials, but depending on the type of decorative wood veneer, the aesthetic appearance may be impaired by heating. This is because there is. Furthermore, since a thermosetting resin is used, thermal energy is required to cure the resin, which leads to the problem of increased manufacturing costs due to the rising prices of fuels such as petroleum.

In view of these circumstances, the inventors have conducted extensive research to develop a manufacturing method that can produce inorganic decorative laminates in a short time and at low cost, which can maintain their beauty for a long period of time. It was discovered that a moisture-curable urethane resin could be used as the binder component of the substrate, that is, the core layer, and the present invention was thus completed.

In other words, this invention provides an inorganic decorative material which is characterized in that a wood decorative veneer is superimposed on a core layer made of a material containing aggregate and a moisture-curable urethane resin as a binder component, and cold-press molded. The gist is the manufacturing method of the board. The present invention will be explained in detail below.

An example of producing an inorganic decorative board having a specific gravity of 9.5 to 0.9 and having a three-layered core layer and a wooden decorative veneer fixed to the core layer will be described.

As a composition for the surface portion (outer peripheral portion) of the core layer, 50 to 70 parts by weight of a moisture-curable urethane resin as a binder and 30 to 50 parts by weight of an inorganic filler (inorganic aggregate) such as fly ash are mixed. As a composition for the middle part (center part) of the core layer, moisture-curing urethane resin 5 to
10 parts by weight 2 parts by weight of lightweight aggregate such as expanded clay, 60 to 70 parts by weight,
and 25 to 30 weight of an inorganic filler such as fly ash. As foamed clay, Reca (made in Denmark) is used.
specific gravity 0.2 to 0.5), etc. In order to accelerate the curing of the urethane resin, after adding a small amount of water to the composition for the surface area and the composition for the intermediate area, as shown in FIG. Composition 22 Composition 1 for surface area
These are filled into a mold 3 (a molding frame etc. may also be used) in the following order to form a core layer 4, and then, after temporary compaction as necessary, a wood cosmetic material moistened with water is filled. Veneer (wet veneer) 5
A cast product is made by placing the surface portion composition 1&, and this cast product is pressed (cold press) using a cold press or the like.

Both are pressure molded by curing the urethane resin. The decorative wood veneer 5 is adhered to the core layer 4 at the same time as it is molded. 75, the manufacturing time is short.

Urethane resin hardens when it absorbs moisture, so there is no need to heat it during molding. With 75S, the aesthetic appearance of decorative wood veneer is not damaged by heating, and the manufacturing cost is low. The amount of water added to each composition is 0.1-1 parts by weight, and the water content of the wood decorative veneer is preferably 60-100s, and the pressure during molding is 6-10 kg/cm, and the water content is 2-10% by weight.
It is best to take about 4 hours. After performing cold pressure, the pressure is released, and then the molded product is dried for curing if necessary, to obtain an inorganic decorative board from which residual moisture has been removed.

In addition, since cold pressing is possible, it is also possible to stack a large number of molded products in a mold or the like with gold paper or the like sandwiched between them, and press them together at the same time. In this way, a large amount of inorganic decorative board can be produced without taking up much space. When painting the surface of decorative wood veneer, you can speed up the drying of the paint by heating the surface (preheat treatment) to remove moisture before painting to an extent that does not impair the aesthetic appearance.

Since the inorganic decorative board obtained in this way uses resin as the binder component in the core layer, the wooden decorative veneer is not contaminated with alkali and can maintain its aesthetic appearance for a long period of time. .

In the above example, the core layer is divided into three layers so that both sides of the core layer are exposed to the binder component, but this does not necessarily have to be the case. Only the surface to which the decorative wood veneer is attached may be rich in binder components. Furthermore, since urethane resin has strong adhesive strength, there may be no need to enrich the surface of the core layer with a binder component. However, if it is necessary to reduce the weight of the inorganic decorative board, making both sides rich in binder components will promote foaming when the urethane resin hardens during manufacturing, contributing to weight reduction. It is preferable to In addition, if the surface to which the decorative wood veneer is attached is rich in binder components, the resin will better wet the decorative wood veneer.
Adhesion of the core layer surface wood decorative veneer becomes easy. The types and blending ratios of raw materials other than the urethane resin are not limited to the above examples. That is, in the above example, in order to obtain a light and heavy inorganic decorative board, a lightweight aggregate was included in the core layer, but a heavier aggregate (normal aggregate, 5 weight aggregates) was added instead of @kei aggregate. It may also be included. Further, an inorganic filler (inorganic aggregate) such as fly ash is not necessarily required, and other raw materials may be used to improve the performance of the inorganic decorative board or for other purposes.

The method for producing an inorganic decorative board according to the present invention is constructed as described above, and a wooden decorative veneer is superimposed on a core layer containing a moisture-curing urethane resin as a binder component and cold-press molded. , it is possible to produce an inorganic decorative board that maintains its beauty for a long time at low cost and in a short time.

Next, examples will be described.

[Example 1] In order to make a core layer with a three-layer structure, raw materials were blended as shown below to make a composition for the middle part and a composition for the surface part.

Composition for middle part: Moisture-curing urethane resin Sumikook (manufactured by Sumitomo Bakelite) 8-layer leaf part light bone aggregate Reka (specific gravity Q, 2 to (1,3)) 70 parts by weight 21 Tongue machine filler (inorganic aggregate) Fly ash 20 parts by weight 5 parts water 0.5 parts by weight Surface composition Moisture-curing resin Sumikook (manufactured by Sumitomo Bakelite Co., Ltd.) 60 parts by weight Inorganic filler (inorganic aggregate) Fly ash 40 parts by weight Water
0.5 parts by weight of the composition for the surface part, the composition for the intermediate part, and 1 part of the composition for the surface part are sprinkled into a casting frame in this order to form a core layer. Temporary compression was performed using a flat plate, and then a decorative wood veneer was placed on top of the surface composition. The wood type of the decorative wood veneer is oak, and the thickness is 0.4 mm. Moreover, before mounting, the wooden decorative veneer was soaked in water to give a moisture content of 60%. Thereafter, these were subjected to cold-press molding (cold-pressing treatment) under the conditions of a pressure of 6 kg/cf7N, room temperature, and a pressing time of 4 hours to obtain an inorganic decorative board with a thickness of 20 mm. The specific gravity of this inorganic decorative board is 0
．． 6 and had a good appearance. In order to paint the decorative surface of the inorganic decorative board (wooden decorative veneer surface), it was heated at 80℃ for 3
Preheating was carried out by holding for a minute, and then the decorative surface was sanded. After this, painting was performed using an aminoalkyl paint, and an inorganic decorative board with an excellent appearance was obtained. This inorganic decorative board is nonflammable, has a low specific gravity, and is easy to carry, so it has good workability.

[Example 2] In the same manner as in Example 1, in order to create a core layer with a three-layer structure, raw materials were blended in the same manner as in the Tsuza to create a parallax for the middle part and a composition for the surface part.

Composition for the middle part Moisture-curable urethane resin Sumitac (manufactured by Sumitomo Bakelite Co., Ltd.), 10 parts by weight Light aggregate Reka 65 parts by weight Inorganic filler (inorganic aggregate) Fly ash 25 parts by weight Water
1
ffi parts Surface layer composition Moisture-curing urethane resin Sumicook (manufactured by Sumitomo Bakelite Co., Ltd.) 70 parts by weight Inorganic filler (inorganic aggregate) Fly ash 30 parts by weight Water
1 part by weight Same as in Example 1, the composition for the surface part, the composition for the middle part, and the composition for the surface part 1 were sprinkled into a casting frame in this order to form a core layer with a three-layer structure. After this, the core layer was temporarily pressed lightly with a flat plate for 5 minutes. Next, a wooden decorative veneer was placed on top of the surface composition. Note that the wood type of the decorative wood veneer is sakshi, and the thickness is 0.4πm. In addition, the moisture content of the wood decorative veneer was 60%. After this, the pressure is 6Kg/c++f
.

Cold-pressing was carried out at room temperature and for a pressing time of 4 hours to obtain an inorganic decorative board with a thickness of 1'8 vrm + specific gravity of 0.65 and an excellent appearance.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an example of a method for manufacturing an inorganic decorative board according to the present invention. 4... Core layer 5... Wood decorative veneer agent Patent attorney Takehiko Matsumoto

Claims (2)

[Claims] (1) A method for producing an inorganic decorative board, which comprises stacking a decorative wooden veneer on a core layer made of a material containing aggregate and using moisture-curable urethane resin as a binder component, and then cold-pressing it. (2) The method for producing an inorganic decorative board according to claim 1, wherein the core layer to which the wooden decorative veneer is attached is rich in a binder component.