JPS6391436A - Decorative panel for space heating - Google Patents

Abstract

PURPOSE:To enhance the dimensional stability retaining the characteristics of wood, prevent odor from being generated at the time of space heating and reduce the cost by a simplified manufacture of a decorative panel for space hating having a wooden panel on one side of a heat generating body by impregnating the wooden panel with synthetic resin liquid, which is dried and solidified. CONSTITUTION:Synthetic resin is dissolved in a solvent, and is impregnated to a wooden panel 3 under either a decompressioned condition or normal condition. It solidifies in the wooden panel 3 by vaporizing the solvent by drying. When a polymer having a hydrophilic radical is used as a synthetic resin, its film covers the surface of cell membrane without entering inside the cell of wood, and so, the dimensional stability of the wooden panel 3 is enhanced and its moisture absorbing property is reduced without impairing the texture of wood and heat insulating characteristics. The wooden panel 3 is bonded onto a top of a heat generating body 1 which utilizes an electric heater or hot water as its heat source with a heat diffusing sheet 2 in-between. The heat diffusing sheet 2 is a lamination of thermally conductive metallic sheet, plastic sheet, paper, fabric etc. It helps to uniformly distribute the heat transmitted from the heat generating body 1, and, at the same time, reinforces or insulates the heat generating body 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a heating decorative board used for floor heating, wall heating, etc.

[Background technology]

BACKGROUND ART Conventionally, many proposals have been made to provide floor heating by disposing a wooden floor material or the like on the upper surface of a waste heat body such as an electric heater (for example, Japanese Utility Model Publication No. 53-2418). In particular, many studies have been conducted on floor heating using wood-based materials because they have a soft wood texture and are pleasant to the touch.

However, when wood materials are used as surface materials, the floor surface is prone to crevices, warps, cracks, etc. due to the repeated heating and cooling caused by the heating elements placed underneath, as well as the repeated absorption and release of moisture. There were drawbacks.

In order to eliminate these drawbacks, Utility Model Application No. 61-9370
As described in Publication No. 9 and Japanese Utility Model Application No. 61-93710, polymerizable resin (monomer, prepolymer, etc.) is injected,
It has been proposed to adhere a hardened wood thin plate to the upper surface of a planar heating element.

However, since a polymeric resin is injected into the thin wood board and cured, there are the following problems.

Fal Polymerizable resin has a relatively low molecular weight, so it easily penetrates into the cells of wood and fills them, resulting in the loss of the soft wood texture of the wood material. It turns into something that feels hard and cold, like a plastic product, and the value of the product decreases significantly.

(bl) Because the polymeric resin penetrates into the cells of the wood, the heat retention properties of natural wood are lost, and when the electricity to the heating element is cut off, the surface of the wood board immediately becomes cold.

FC+ Because a large amount of polymeric resin permeates into the wood, the lightness that is characteristic of wood is lost, making it difficult to carry and transport.

It is difficult to completely cure the polymerizable resin injected into the fd+ wood Wyi board, and there is a risk that unreacted substances will evaporate due to the heat during heating and generate a bad odor.

te+ Due to the shrinkage of the polymeric resin during curing, the wooden thin board also shrinks, so the dimensions of the resulting flooring material, etc. are not constant.

(fl Also in the manufacturing process, the polymerizable resin is mixed with a polymerization initiator and then injected into the thin wood board and cured. Therefore, the pot life of the polymerizable resin is short, and the resin gels during storage or handling. It is necessary to prevent this, which makes process control extremely complicated, and also requires a cooling device for the polymerizable resin, resulting in high manufacturing costs.

[Purpose of the invention]

The purpose of this invention is to improve dimensional stability while retaining the characteristics of wood, such as the soft texture, heat retention, and lightness that are inherent to wood materials, and to prevent the generation of bad odors due to unreacted substances during heating. It is an object of the present invention to provide a heating decorative board which can prevent the above problems, and which is easy to manufacture and can reduce costs.

[Disclosure of the invention]

The heating decorative board of the present invention is a heating decorative board in which a wood board is arranged on one side of a heating element, and the wood board is made by injecting a synthetic resin liquid and drying and solidifying it. It is.

In other words, this invention does not inject a polymerizable resin such as a monomer or prepolymer into a wooden board and harden it, as in the past, but instead injects already polymerized synthetic resin into the wood board, so that the polymerizable resin is cured. In order to create a membrane that covers the surface of the cell membrane without penetrating into the wood cells,
The wood board will not lose its natural characteristics such as the soft texture and heat retention properties of the wood, and when installed on the floor, it will not cause cracks or warping due to repeated cold heat generated by the heating element. , crank, etc. can be prevented from occurring.

In addition, synthetic resins are more susceptible to 'lf into wood than polymeric resins.
Since the z'lr property or the impregnating property is much smaller, the lightness and machinability of wood Mh, such as cutting, can be maintained almost unchanged.

In addition, according to the present invention, since polymerized synthetic resin is injected, no unreacted substances remain in the wood board.
Therefore, there is no odor caused by unreacted substances, and unlike conventional methods, there is no need for a cooling device to prevent gelation when handling polymeric resins, or to pay close attention to process control. This eliminates the need for such complicated operations, making it easy to manufacture and reducing costs.

FIG. 1 is a sectional view showing a heating decorative board according to the present invention, in which a wooden board 3 is attached via a heat diffusion sheet 2 to the upper surface of a sheet-like heating element 1 whose heat source is an electric heater, hot water, etc. be done.

The heat diffusion sheet 2 is made of a metal sheet, resin sheet, paper, cloth, etc. having good thermal conductivity, and is made of a metal sheet, a resin sheet, paper, cloth, etc. alone or a combination of two or more of them, and is used to uniformize the distribution of heat transfer from the heating element 1. At the same time, the heating element 1 is also reinforced or insulated. Such a heat diffusion sheet 2 can be omitted if the surface temperature of the heating element 1 is uniform and the heat distribution from the heating element 1 to the wooden board 3 is uniform.

The wood board 3 has a thickness of about 0.5 to 81 cm, and is composed of a single wood veneer or a plywood surface with a wood veneer attached to the surface. When pasting wood veneers to plywood, it is preferable to do so so that the fiber direction on the plywood surface and the fiber direction of the wood veneer are perpendicular. 3. It is possible to prevent warping and cracks from occurring.

The synthetic resin liquid injected into the wooden board 3 is a synthetic resin dissolved in a suitable solvent. The synthetic resin includes, for example, hydrophilic groups (carbonyl group, hydroxyl group, amide group,
Polymers having scratchable groups such as mino groups and ether groups are preferably employed. Examples of such polymers include polyacrylic esters, polymethacrylic esters, polymethacrylic amide, polyacrylic amide, polyvinyl alcohol, polyvinyl acetate, polyurethane, cellulose derivatives, polyethyleneimine, and the like. Also,
The degree of polymerization of the polymer used is not particularly limited, and may be within a range that does not impede impregnation into the wooden board 3. Such a synthetic resin is dissolved in a solvent and injected into the wooden board 3 under reduced pressure or normal pressure, and is solidified within the wooden board 3 by evaporating the solvent by drying. In addition,
When the wooden board 3 is made of plywood and a wooden veneer, it is preferable to bond them together in advance and then impregnate them with a synthetic resin liquid in order to prevent peeling due to poor adhesion.

The reason why the use of such synthetic resins prevents warping and cracking of wood boards and stabilizes their dimensions without losing the texture of natural wood is that conventionally used polymeric resins (monomers, prepolymers, etc.) Because it has a low molecular weight, it easily penetrates into the cells of the tree, and the cells become filled with resin, turning the entire body into plastic and losing the texture of natural wood. It is presumed that this is because synthetic resins have a higher molecular weight than polymerizable resins such as monomers, so they penetrate into the cells of the wood and form a membrane that covers the surface of the cells. In particular, when a polymer with hydrophilic groups is used as a synthetic resin, the bond with the cell membrane becomes strong through the hydrophilic group, and the membrane does not easily peel off even when exposed to repeated cold and heat. The synthetic resin can be well penetrated into the inside of the wooden board 3 along the cell membrane without penetrating into the inside of the wooden board 3.

In this way, the synthetic resin injected into the wood board 3 forms a membrane and covers the surface of the cell membrane without penetrating into the wood cells, so it does not impair the soft texture and heat retention properties of the wood. ,
It is possible to improve the dimensional stability of the wooden board 3 and reduce its water absorption compared to when a polymeric resin is used (see examples below), and it is possible to reliably prevent scratches, warping, cranks, etc. become able to. Moreover, since the synthetic resin only coats the surface of cell membranes, the amount of impregnation is much lower than that of polymeric resins (in the examples and comparative examples described later, the impregnation rate is less than half that of polymeric resins). ), therefore, wood's inherent lightness, moisture absorption/release properties, and machinability such as cutting are not compromised.

Note that the same effect can be obtained by using an insoluble synthetic resin instead of a solvent-soluble synthetic resin and injecting a suspension thereof into the wooden board.

FIG. 2 is a sectional view showing an example of a floor heating panel using the heating decorative board according to the present invention. This floor panel 6 is constructed by bonding a frame material 5 whose periphery protrudes beyond the base material 4 to the upper surface of a base material 4 such as plywood, and placing a heating element 1 and a heat diffusion sheet 2 in a recess formed by the frame material 5. A wooden board 3' consisting of a plywood 31a and a wooden veneer 3'b is arranged on the upper surface of the frame member 5, and these are glued together.

To construct such a floor panel 6, as shown in FIG. The buried wood 10 is buried in the recess 11 on the surface of the floor panel 6.

Next, the heating decorative board of the present invention will be described with reference to Examples.

Example 2 A wooden veneer made of teak wood (thickness 1 dragon) was placed in a vacuum container, and the atmosphere was evacuated for 20 hours at a pressure below 1QitHg. While the pressure inside the container was reduced, synthetic resin liquid (50% by weight methyl ethyl ketone of polyurethane resin) was added. solution) was injected, the pressure was returned to normal pressure, and then left for 10 hours. Next, take out the unit from the container, remove the synthetic resin liquid on the surface, and
It was dried at 00°C for 5 hours. Impregnation rate (pickup rate)
was 45-65%. This was adhered to the surface of a planar heating element via a metal plate to obtain a heating decorative board.

Comparative Example 2 Polymerizable resin (100 parts by weight of unsaturated polyester, 20 parts by weight of styrene, 412 parts by weight of benzene baroxa) was injected into a vacuum container, evacuated for 1 hour, and further 10 parts by weight.
After pressurizing at ~12 kg/cm'' for 5 hours, the veneer was taken out from the container, the resin on the surface was removed, and the
A heating decorative board was obtained in the same manner as in the example except that the resin was cured by heating and pressurizing at a pressure cuff of ~10 kg/cm'' for 2 to 3 minutes at a pressure cuff of 10 kg/cm. It was 120-150%.

The dimensional change rate, water absorption, and moisture absorption and moisture release properties of the resin-treated veneers in the above Examples and Comparative Examples were examined.

The results will be explained below.

(Dimensional change rate and water absorption test) Resin-treated veneers in Examples and Comparative Examples were immersed in room temperature water for 20 hours continuously, along with untreated veneers, and the results were evaluated in the radial direction (direction perpendicular to the annual rings) and Changes over time in each dimension and water absorption rate in the tangential direction (tangential direction of annual rings) were investigated. The results are shown in FIGS. 4 to 6.

From these test results, it can be seen that the resin-treated veneer in the example has both lower dimensional change rate and water absorption than the comparative example.

(Moisture absorption/moisture release test) Resin-treated veneers in the Examples and Comparative Examples, together with untreated veneers, were tested in a dry atmosphere at 60°C for 8 hours and in a dry atmosphere at 60°C and 90% humidity. The cycle was repeated 10 times, and the moisture absorption and release rate for each cycle was determined. The results are shown in FIG. From the same figure, the resin-treated veneer in the example has the same moisture absorption and moisture absorption as normal wood boards that are not treated with resin.
It can be seen that it has moisture release properties and retains the characteristics of natural wood.

〔Effect of the invention〕

According to this invention, instead of injecting a polymerizable resin such as a monomer or prepolymer into a wooden board and curing it as in the past, already polymerized synthetic resin is injected into the wood board, so that the polymerizable resin can be cured. In order to create a membrane that covers the surface of the cell membrane without penetrating into the cells of the wood, we created a membrane that takes advantage of the characteristics of wood, such as the soft texture and heat retention properties of wood boards. Moreover, when applied to a floor surface, etc., it is possible to prevent crevices, warping, cranks, etc. from occurring on the floor surface etc. due to repeated cold heat generated by the heating element.

Furthermore, since synthetic resins have far less penetrating or impregnating properties into wood than polymeric resins, the light weight and machinability of wood boards, such as cutting, can be maintained almost unchanged.

In addition, according to the present invention, since the polymerized synthetic resin is inhabited, no unreacted substances remain in the wood, and therefore no bad odor is generated due to unreacted substances.
Furthermore, manufacturing is easier, as there is no longer the need for a cooling device to prevent gelation when handling polymeric resins, or the complicated work of paying close attention to process control. Cost reduction can be achieved.

[Brief explanation of the drawing]

Figure 1 shows l [! 2 is a sectional view showing an example of the decorative board for rooms; FIG. 2 is a sectional view showing an example of the case where it is applied to a floor heating panel; FIG. 3 is a sectional view showing the state of installation on the floor; FIGS. FIG. 5 is a graph showing the measurement results of the dimensional change rate, FIG. 6 is a graph showing the results of the water absorption test, and FIG. 7 is a graph showing the results of the γV-moisture resistance test. 1...Heating element, 2...Heat diffusion sheet, 3...Wood board, 6...Floor panel agent Patent attorney Akio Miyai 2:〜゛′:、′□
”: 英'5 □ Epithet Time (Xu Mun) □ Soaking 1 hour (咋藺) Fig. 5 □ Soaking!t time (Shi Ma) + 234567E19K) □ “Sui I /7 1 Shi Moku Fig. 7 Hand inspection by Hosho) (November 14, 1986)

Claims (6)

[Claims] (1) A heating decorative board in which a wooden board is arranged on one side of a heating element, wherein the wooden board is injected with a synthetic resin liquid and dried and solidified. (2) Claim No. 2, wherein the wood board is a wood veneer (
Decorative heating board described in item 1). (3) The heating decorative board according to claim (1), wherein the wood board is composed of plywood and a wood veneer adhered to the surface of the plywood. (4) The heating decorative board according to claim (3), wherein the plywood and the wood veneer are pasted together with their fiber directions perpendicular to each other. (5) The heating decorative board according to claim (1), wherein the synthetic resin liquid is a solution of a polymer having a hydrophilic group. (6) The heating decorative board according to claim (1), wherein the wooden board is arranged on the heating element via a heat diffusion sheet.