JPH03258538A - Composite and its manufacture - Google Patents

Abstract

PURPOSE:To obtain a composite whose heat resistance is favorable, by a method wherein a metallic coating layer is formed on a base obtained by sticking and unifying chips to the inside or the external circumferential part of which an incombustible inorganic chemical compound is stuck through an adhesive substance containing an incombustible inorganic chemical compound. CONSTITUTION:Chips obtained by cutting lumber by making use of a cutting device is made incombustible by filling into or adhering to or sticking to the inside of a cellular hole and/or an inner wall surface of the cellular hole and/or the external circumferential part of the chips. The cut wooden pieces which becomes incombustible are stuck to each other by making use of an adhesive substance into which the incombustible inorganic chemical compound is mixed and an incombustible chip mat is manufactured. After the incombustible chip mat is made into an incombustible chip plate by molding an unifying the same, a metal is sprayed on at least one surface of the same, then a metallic coating layer is formed by cooling the same and a composite is manufactured. The composite is neither deteriorated nor carbonized even by heat transmitted through the metallic coating layer.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a composite material and a method for manufacturing the same, and more particularly to a composite material in which a metal coating layer is formed on a noncombustible wood chip board and a method for manufacturing the same.

Prior art> Japanese Patent Application Laid-Open No. 50-12948 describes hardpods, plywood,
900 on the surface of base boards such as wood, slate, ceramics, etc.
A heat-resistant pod is disclosed in which a metal or alloy having a melting point of 1,000 to 1,600 degrees Celsius is thermally sprayed, and a metal or alloy having a melting point of 1,000 to 1,600 degrees Celsius is further thermally sprayed thereon. This conventional board is thermally sprayed in two layers and is said to have excellent heat resistance and water resistance.

<Problems to be Solved by the Invention> Although the heat resistance of the board according to the above-mentioned prior art is improved by the metal layer covering the surface of the base material, if the base material is an organic material such as hardboard, plywood, or wood, The base material itself gradually deteriorates or becomes carbonized due to the influence of heat transmitted through the metal layer, and there is a risk that it will eventually catch fire. For this reason, at present it has not been used as a building material, furniture, or construction member in places such as kitchens.

<Means for Solving the Problems> The present invention was completed through intensive efforts to solve the problems in view of the drawbacks of the prior art. The wood shavings in which a nonflammable inorganic compound is filled, attached, or fixed in the pores and/or on the inner wall surface of the cell pores and/or on the outer periphery of the wood shavings are the same as the above-mentioned nonflammable inorganic compound, or are made of poplar, willow, etc. Chipper 1 for hardwood lumber
By cutting using a cutting device such as a 7-reker, it can be obtained in the form of chips, flakes, strands, etc.

The obtained wood chips are washed with water if necessary, and then dried using a drying device.

A nonflammable inorganic compound is filled into the voids such as cell pores and conduit pores of the dried wood chips, or the nonflammable inorganic compound is fixed or adhered in a layer along the inner wall of the cell pores, and then the wood chips are Nonflammability treatment is performed by fixing or adhering the nonflammable inorganic compound to the outer periphery of the piece. This nonflammability treatment can be performed, for example, by the following steps. That is, the wood chips are sufficiently immersed in an aqueous solution of a water-soluble inorganic salt (hereinafter referred to as "first solution") to impregnate it. At this time, it is effective to forcibly accelerate the impregnation treatment by applying reduced pressure or increased pressure. As the first liquid, MgCl22. MgBr2゜MgSO
+・H20, Mg(N OJz・6 HzO, AQCQ
3°AQBr,,A122(SQ,)3. Ao, (NO
3) 3'9H20°CaCQ, CaBr2. Ca(NO
3)2. ZnCff2゜ uses a non-combustible wood particle board that is adhesively molded and integrated via an adhesive substance mixed with different non-combustible inorganic compounds as a substrate, and at least one surface of the substrate is coated with a metal coating layer by thermal spraying. It is a composite material characterized by being formed of.

The present invention also provides a method for manufacturing such a composite material, which involves cutting wood with a cutting device to obtain wood chips, and then cutting the wood chips into cell pores and/or
Alternatively, a nonflammable inorganic compound is filled, attached, or fixed to the inner wall surface of the cell pores and/or the outer periphery of the wood shavings, and the wood shavings thus treated to be nonflammable have a nonflammable property that is the same as or different from the above nonflammable inorganic compound. Adhesively using an adhesive substance mixed with an inorganic compound to form a non-combustible wood particle mat, and molding and integrating the non-combustible wood particle mat to form a non-combustible wood particle board;
The present invention is characterized in that a metal coating layer is formed by thermally spraying a metal onto at least one surface of the noncombustible wood chip board and then cooling it.

The wood chips used in the present invention are, for example, softwood materials such as pine, cedar, and cypress, or lauan, capor, chestnut, BaC42, etc.
2H20, BaBr2. An example is an aqueous solution of Ba(NOx)+. After impregnating with the first liquid, the liquid is removed, and the wood chips are dried to bring the surface to a dry state or an absolutely dry state, and if necessary, component crystals of the first liquid deposited on the surface are removed. Next, a compound liquid that reacts with the first liquid to produce a water-insoluble, nonflammable inorganic compound (hereinafter referred to as the "second liquid") is added to and mixed with the wood chips using a blender spray or the like, or the wood chips are immersed. By letting it soak, the wood chips are impregnated with the second liquid. As in the case of the first liquid, impregnation of the second liquid into the wood chips can be promoted by treatment under reduced pressure or pressure. As the second liquid, Na2COs, (NH4)2CO3
, H2SO4゜Na2s04+ (NH4)2S04.
H2Po, +Na=HP O41(NH4)2HP
O41HsBO3+N a B O2, N H4B 0
2nd grade is exemplified. By applying and impregnating the second liquid, the first liquid and the second liquid react in the wood shavings, and a nonflammable inorganic compound is generated. Nonflammable inorganic compounds produced include magnesium phosphate, calcium phosphate, barium phosphate, aluminum phosphate, and magnesium borate.

Magnesium carbonate, calcium carbonate, zinc phosphate.

Examples include calcium compounds such as barium carbonate, calcium nitrate, and barium nitrate, magnesium compounds, aluminum compounds, barium compounds, lead compounds, zinc compounds, and silicate compounds. After the reaction is completed, the liquid is removed and dried. Since this nonflammable inorganic compound is water-insoluble, after drying, it is filled in, adhered to, or fixed in the cell pores of the wood chips or on the inner wall surface of the cell pores and the outer periphery of the wood chips. As a result, even if the cell wall of the outer periphery of the wood chip contains cracks or fissures, the nonflammable inorganic compound is present in a form that blocks or fills them.

It is preferable that the nonflammable inorganic compound is mixed in at a ratio of 33% by weight or more to the wood chips, and if it is less than this, sufficient fireproof performance cannot be obtained. In addition, in order to increase the reaction efficiency between the 11th liquid and the 2nd liquid, the addition and mixing of the 2nd liquid was carried out under a heated atmosphere.
In particular, it is preferable to carry out at a temperature of 40°C or higher, more preferably 50°C or higher.

In addition, the first and second liquids are heated and the excess nonflammable inorganic compounds that fall off and accumulate are recovered, and if necessary, this is dried and sieved, and then mixed into the adhesive material. Also good.

After cutting the obtained particle mat to a specified length, it is inserted into a hot press and hot-pressed to obtain a wood particle board. The moisture content of this wood chip board is preferably 20% or less. The reason for this is that if the moisture content is 20% or more, the internal water on the sprayed surface side will evaporate and move to the opposite side due to the influence of heat during metal spraying, which will cause the internal balance to collapse, causing the wood to dry during metal spraying. This is because the particle plate itself tends to be warped with the sprayed surface side concave.

After sanding the surface (the side on which the metal coating layer will later be formed) of the obtained wood chip board as necessary, the necessary amount of molten metal is sprayed using a thermal sprayer. Metal spraying can be carried out to cover not only the front surface of the wood chip board, but also necessary parts such as the back surface, butt surface, and the entire surface. It is preferable that the temperature of the surface of the wood chip board to be subjected to metal spraying is 40 to 100'O, and from this point of view, the wood chips after hot pressure forming are immersed or If ultrasonic waves or mechanical vibrations are applied during immersion of the two liquids, diffusion and reaction into the wood chips will be facilitated. Note that the order of treatment with the first liquid and the second liquid is not limited, and it is of course possible to perform the treatment with the second liquid first.

The wood shavings that have been rendered incombustible in this way are put into a mixing device,
Adhesive substances, sizing agents, etc. are added and mixed to adhere. Next, the wood chips are blown with air, and a continuous wood chip mat of a constant thickness is formed on a conveying device using a forming device. One or more kinds of noncombustible inorganic compounds are mixed into the adhesive substance used to form and integrate the noncombustible wood chips. The nonflammable substance mixed into the adhesive substance may be the same or different from the one produced by the reaction with the first liquid and the second liquid. In the case of the first liquid), an excessively produced nonflammable inorganic compound is precipitated in the treatment tank, so it is efficient and economical to collect this and mix it into the adhesive material. Alternatively, while the temperature of the dry board after the non-combustibility treatment is high, or at least after the temperature of the surface of the wood chip board on which the metal coating layer will be formed is warmed,
Preferably, metal spraying is performed. If the temperature is below 40°C, the sprayed molten metal will immediately cool and solidify, so that the adhesion force due to the anchoring effect to the coated surface of the wood chip board will not be sufficiently exerted. Moreover, when it is 10,000 or more, the influence of the temperature of the molten metal is strong, deteriorating the surface of the wood chip board, and reducing the adhesion. Metal alloys such as tin, lead, zinc, copper, brass, bronze, aluminum, nickel, iron, and stainless steel are preferably used as the metal to be thermally sprayed.

As the thermal spraying method, any of the commonly used electric wire spraying method, gas wire thermal spraying method, and powder spraying method may be employed. The sprayed metal is solidified by subsequent cooling, and a metal coating layer is formed in close contact with the surface of the wood chip board.

<Function> Heat resistance is improved by the metal coating layer formed on the surface of the wood chip board. A wood chip board is made by filling, adhering, or fixing a nonflammable inorganic compound in the cell pores of wood chips, on the inner wall surface of the cell pores, or on the outer periphery of the wood chips, and then molding and fixing the wood chips in one piece. The adhesive material used to make the particle board is also mixed with a nonflammable inorganic compound to make it noncombustible, so it will not deteriorate or carbonize even when heat is transmitted through the metal coating layer.

<Example> Chip-shaped wood shavings obtained by putting radiata pine logs into a chipper were put into a drying device and dried, and then immersed in an aqueous solution containing barium chloride as the main component for 20 minutes under reduced pressure.
After the diffusion treatment, centrifugal dehydration treatment was performed. Next, the wood chips are immersed in an aqueous solution containing ammonium phosphate as a main component for 20 minutes under reduced pressure to react with barium chloride, thereby removing the inside of the cell pores of the wood chips or the outer periphery of the wood chips. A flame retardant treatment was carried out to fill or adhere a nonflammable inorganic compound consisting of water-insoluble barium phosphate and barium hydrogen phosphate to the tube, followed by a centrifugal dewatering treatment.

The moisture content of the wood chips was then adjusted to 7% by hot air drying. This flame-retardant treatment makes the rawhide superior in quality, and since the base material, the wood chip board, is sufficiently flame-retardant, it will not deteriorate or carbonize due to the heat transmitted through the metal coating layer. , there is no risk of ignition in the long term. Therefore, it can be suitably used widely as a building material or furniture/building member even in places where fire is used, such as kitchens.

Claims (3)

[Claims] (1) Inside the cell pore and/or inner wall surface of the cell pore and/or
Or, a wood chip whose outer periphery is filled with, adhered to, or fixed with a nonflammable inorganic compound is bonded through an adhesive substance mixed with a noncombustible inorganic compound that is the same as or different from the above noncombustible inorganic compound. 1. A composite material comprising, as a substrate, a noncombustible wood particle board formed by integrally adhesive molding, and a metal coating layer formed by thermal spraying on at least one surface of the substrate. (2) Cutting wood with a cutting device to obtain wood chips, and then cutting the inside of the cell pores and/or the inner wall surface of the cell pores of the wood chips and/or
or by filling, adhering, or fixing a nonflammable inorganic compound to the outer periphery of the wood shavings, and bonding the wood shavings that have been made nonflammable with a nonflammable inorganic compound that is the same as or different from the above nonflammable inorganic compound. adhesive to form a non-combustible wood particle mat, the non-combustible wood particle mat is molded and integrated to form a non-combustible wood particle board, and at least one of the non-combustible wood particle boards is A method for producing a composite material, which comprises forming a metal coating layer by thermally spraying a metal onto a surface and then cooling the material. (3) The method for manufacturing a composite material according to claim 2, characterized in that the metal spraying is performed at a temperature of the integrally molded noncombustible wood chip board at a temperature of 40 to 100°C.