JP2009190260A - Conductive wood and its manufacturing method and device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide conductive wood by easily processing natural wood, and its manufacturing method and device. <P>SOLUTION: Wood put in a container 2 is put in a pressure tank 3, and the inside of the pressure tank 3 is depressurized as the tank is heated by a heater 5. Thereafter, the inside of the pressure tank 3 is returned to normal pressure, and, with the wood immersed in an aqueous solution or aqueous dispersion of conducting materials inside the container 2, the inside of the pressure tank 3 is pressurized. The wood is then taken out of the pressure tank 3 and dried to obtain the conductive wood. The conductive wood is impregnated with one or a plurality of an antistatic agent, an ion conducting agent, ultrafine metallic powders, fine metal fibers, ultrafine metal oxide powders, conductive carbon, carbon nanotubes, fullerenes, a plant extract containing minerals, and a wood ash extract containing minerals, as the conducting materials. The conducting materials are retained in at least a portion of the vessels of the wood. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wood provided with electrical conductivity and a method for manufacturing the same or an apparatus therefor.

Conventionally, in the case of a conductive polymer material formed by mixing a conductive material into a polymer material having a high resistance value, the charge is removed by always flowing it as ground. However, in this case, when the ground is lost, electricity is stored and stored. In particular, when it is set to 10 ⁵ Ω or less, it works like a power storage and capacitor close to metal. Therefore, when a charged person approaches, there is a risk of discharging from the human body. And electromagnetic waves by electrostatic discharge may be generated or electrostatic shock may be generated.

In addition, sufficient effects cannot be obtained unless it is 50% RH or higher in order to eliminate static electricity by adjusting humidity. The electrical conductivity of wood varies greatly depending on the moisture content. As a building material, the moisture content is 8 to 12%. At this time, the surface resistance value is around 10 ¹¹ Ω, and static electricity is not generated, but the static elimination function is insufficient. When the moisture content exceeds 45%, it becomes 10 ⁶ Ω level and approaches conductivity. However, it is not stable and is in the state of so-called raw wood and cannot be used generally. In general, those having a surface resistance of 10 ⁶ to 10 ¹¹ Ω are semiconductive, and those having a surface resistance of 10 ⁵ Ω or less are said to be conductive.

Among these, synthetic wood includes one disclosed in Patent Document 1. This is because 0.4 to 1.5 parts by weight of a surfactant is blended with 100 parts by weight of a molding composition in which 85 to 60 wt% of a polyolefin synthetic resin and 15 to 40 wt% of wood flour are blended. The surface has an electrical resistance value of 1.0 × 10 ¹⁴ Ω / cm ² or less.

  However, the thing of patent document 1 is a synthetic wood, and mainly has a synthetic resin. Among synthetic resins, polyolefins are particularly easily charged, so synthetic wood is easily charged. Therefore, it is impregnated with an antistatic agent. Therefore, it is not natural wood and the material is completely different. On the other hand, there is no natural wood that has conductivity.

JP2007-169350

  In order to solve the disadvantages of the prior art, the present invention provides a wood having conductivity by easily processing natural wood, and also provides a manufacturing method and a manufacturing apparatus for solving the problem. To do.

  Therefore, the invention of claim 1 includes an antistatic agent, an ion conductive agent, a metal ultrafine powder, a fine metal fiber, a metal oxide ultrafine powder, conductive carbon, carbon nanotubes, fullerenes, and minerals as a conductive material in wood. Conductive wood obtained by impregnating an aqueous solution or aqueous dispersion composed of one or more of plant extract and mineral-containing wood ash extract, and hardening and holding the conductive material in at least a part of the wood conduit. It was.

  The invention of claim 2 is the conductive wood according to the invention of claim 1, wherein a surfactant is added as an auxiliary to the aqueous solution or aqueous dispersion. The invention of claim 3 is the conductive wood according to the invention of claim 1 or 2, wherein a water-soluble polymer or polymer emulsion is added as a retaining agent to the aqueous solution or aqueous dispersion.

  The invention of claim 4 is the conductive wood according to the invention of claim 1, 2, or 3, wherein borax or boric acid is added to the aqueous solution or aqueous dispersion. Further, the invention of claim 5 is the conductive wood according to the invention of claim 1, 2, 3 or 4, wherein a solution of chitin chitosan in 1 to 3% pyroligneous acid solution is added to the aqueous solution or aqueous dispersion. It was.

  The invention of claim 6 is the invention of claim 1, 2, 3, 4 or 5, wherein a monomer is added to the aqueous solution or aqueous dispersion, impregnated into the wood, poured, dried, A conductive wood was obtained by injecting a hardener and a crosslinking agent into the wood and polymerizing and fixing them inside the conduit.

  The invention of claim 7 puts the wood to be processed into a pressure tank, depressurizes the inside of the pressure tank while heating, then returns the inside of the pressure tank to normal pressure, The conductive material according to any one of claims 1 to 6, wherein the wood is immersed in an aqueous solution or water dispersion of a conductive material, the pressure tank is pressurized in this state, and then the wood is dried. It was set as the manufacturing method of wood.

  The invention according to claim 8 is provided with a pressure tank in which the container can be carried, and the container which can be carried in the pressure tank contains wood as an object to be processed, and the aqueous solution or water dispersion of the conductive material in the pressure tank. The apparatus according to claim 1, wherein a liquid is allowed to be injected into the container and a device for reducing the pressure in the pressure tank, a device for pressurizing the pressure tank, and a heating device for heating the container are provided in the pressure tank. 7 to produce a conductive wood used in the method described in 7.

Wood has a cavity layer of nearly 50% due to the properties of the material. In the invention of claim 1, since the conductive material film is formed on the inner wall of each conduit forming the hollow layer, the surface area becomes very large. At the same time, the celluloses constituting the conduit are Although the resistance value is relatively high, the water content is stabilized by a conductive material such as a surfactant, and the static neutralization area that can treat static electricity is tens of thousands of times that of a flat surface. The capacity can be increased. Therefore, the charge eliminating function is extremely large. Therefore, static electricity charged on the human body can be erased without touching the ground by simply touching the conductive wood. In addition, if the conductive wood is approached without being touched, there is a force to draw electric lines of force from the charged body, and a neutralization effect is exhibited although it is gentle. In this case, a surface resistance value of 10 ⁶ to 10 ⁹ Ω is sufficient. In addition, since conductivity is further increased, electrodes are connected to both ends, and a voltage is applied, current flows and heat is generated, so that it can be applied to mild floor heating and heat insulation (surface resistance value 10 ² to 10 ^5. Ω).

  In addition, a space of several microns or less is formed inside the conductive material film on the inner periphery of each conduit, and a function of adsorbing odorous substances inside each conduit occurs. Therefore, when the conductive wood of the present invention is placed indoors, moisture in the air, odorous substances coming from the human body, harmful substances causing indoor sick house syndrome, etc. can be adsorbed and fixed in the wood.

  In the invention of claim 2, since the surfactant is added as an auxiliary agent to the aqueous solution or aqueous dispersion of the conductive material and impregnated in the wood, the conductive material is easily impregnated with the wood reliably. In the invention of claim 3, a water-soluble polymer or polymer emulsion is added as a holding material to the aqueous solution or dispersion of the conductive material, and the wood is impregnated and cured. The material is held fixed and the effect is sustained.

  Moreover, according to the invention of Claim 4, the effect as repellents, such as a tick and a cockroach, can also be anticipated. Further, according to the invention of claim 5, since the solution of chitin chitosan dissolved in 1 to 3% pyroligneous acid solution is added to the aqueous solution or aqueous dispersion, the chitin chitosan dissolved in pyroligneous acid solution loses water in the aqueous solution. It becomes insoluble after drying and solidification. Therefore, it can be used for a long time as an adsorbent.

  According to the invention of claim 6, a monomer is added to the aqueous solution or aqueous dispersion and injected into the wood, and after drying, a curing agent and a cross-linking agent are further injected into the wood to add the inside of the wood conduit. Since these are polymerized, solidified and fixed, the conductive material is strongly fixed. Moreover, if the invention of Claim 7 and 8 is used, the electroconductive wood of Claim 1 can be manufactured easily and reliably.

  This invention puts wood in a pressure tank, depressurizes while heating the pressure tank, removes moisture and air in the wood, and simultaneously opens a valve in the wood conduit, Make it easier to inject solutions. Thereafter, the pressure tank is once returned to normal pressure, and in the state where the pressure tank is pressurized, an aqueous solution or an aqueous dispersion composed of a conductive material and a fixing agent is injected into the wood in the pressure tank, The wood is then dried. Thereby, on the wood, as a conductive material, an antistatic agent, ionic conductive agent, metal ultrafine powder, fine metal fiber, metal oxide ultrafine powder, conductive carbon and a plant extract containing carbon nanotubes, fullerene, minerals, One or a plurality of wood ash extracts containing mineral is impregnated to produce conductive wood in which the conductive material is held in at least a part of the wood conduit.

  The antistatic agent may be a conventionally known antistatic agent, for example, a cationic or anionic surfactant such as a compound having a quaternary ammonium salt, a compound having an alkylpyridinium salt, a compound having a sulfonate, or an alkylene oxide. Nonionic surfactants such as homopolymers, alkylene oxide copolymers, aliphatic alcohol / alkylene oxide adducts, long-chain aliphatic substituted phenol / alkylene oxide addition polymers, polyhydric alcohol aliphatic esters, and betaine amphoteric Surfactant is mentioned.

In addition, as an ion conductive agent, an organic ion conductive agent in which a metal ion such as lithium ion or sodium ion is encapsulated in an unsaturated polyester oligomer, or a conductive powder (electronic conductor) of a metal or an oxide thereof, for example, , Tin oxide (SnO ₂ ), antimony pentoxide (Sb ₂ O ₃ ), zinc oxide (ZnO), titanium oxide (T ₁ O ₂ ), and aluminum oxide (AL ₂ O ₃ ).

Examples of the aqueous solution containing the conductive material include the following.
Surfactant 0.5-2%
Conductive agent 1-3%
Fixing agent 0.2-5%
Moisture 97-92%

  Next, the manufacturing method of the electrically conductive wood of this invention is demonstrated. As shown in FIG. 3, wood 1 to be processed is placed in a container 2. And the said container 2 is put into the pressure tank 3 shown in FIG.1 and FIG.2. The pressure tank 3 has an opening / closing door 3a on one side, and a rail 4 is provided so that the container 3 can be easily placed inside. Thereafter, the pressure tank 3 is sealed, the heater 5 provided in the pressure tank 3 is operated, and the pressure tank 3 is heated by an exhaust pipe 6 connected to a vacuum pump (not shown) while heating the interior to about 50 ° C. Reduce the pressure in 3. As a result, the air inside the wood 1 placed in the container 3, particularly moisture and air in the conduit, are extracted. At the same time, the valve in the wood conduit is opened to facilitate the injection of the solution.

Thereafter, the pressure tank 3 is once returned to normal pressure. And the solution of the said electrically conductive material is inject | poured into the container 2 in the pressure tank 3 with the chemical | medical solution injection | pouring pipe 7 provided in the said pressure tank 3, The said wood 1 is made into the state immersed in the aqueous solution of the electrically conductive material (FIG. 3). The composition of the aqueous solution of the conductive material here is a surfactant as an auxiliary agent for the antistatic agent, a water-soluble polymer liquid (for example, polyethylene oxide, hydroxyethylcellulose-2hydroxypropyltrimethylammonium chloride ether) as a retention agent, and a polymer emulsion. (For example, acrylic type, polyester type, urethane type) and natural polymer liquid (for example, chitosan, dextrin, polyvinyl alcohol) added are used. The pressure tank 3 is pressurized simultaneously with the injection of the aqueous solution of the conductive material. This is performed by injecting compressed air into the pressure tank 3 through the pressure pipe 8 by a pressure pump or a compressor outside the pressure tank 3. The pressure at that time is 5 to 8 kg / cm ² and is performed for ² to 3 hours. Thereby, the aqueous solution of the conductive material is pressed into each conduit of the wood 1 in the container 2.

  Thereafter, the open / close door 3a of the pressure tank 3 is opened, the container 2 is taken out, each wood 1 is air-dried for several days in a well-ventilated place, and then heated to between 35 ° C. and 85 ° C. Heat to dry for several days.

  Thereby, the film | membrane which consists of said electrically conductive material is formed in the inner wall of each conduit | pipe of the timber 1, and the space below 30 microns is made in the center part. Accordingly, the membrane of the conductive material has a very large surface area, and at the same time, the celluloses constituting the conduit have a relatively high insulation resistance value, but the added surfactant stabilizes the water content, so that the conductive material and the fibers are electrically conductive. The static elimination area capable of treating static electricity due to the action of the material is several tens of thousands times as large as that of a flat surface, and the capacitance can be increased.

As a characteristic of the conductive wood A treated in this way, even in the case of wood having a moisture content of around 8 to 12% that is used on a daily basis, the surface resistance value is 10 ⁶ Ω level as an electrostatic property, and the humidity is 10% RH. Because it stabilizes even under, it can be expanded to the field of countermeasures against static electricity of wood. Therefore, even if the conductive wood A is not grounded, the static electricity charged on the human body of the person can be erased only by touching or approaching the person. In addition, when the conductive wood A is cut into a semicircle in cross section as shown in FIG. 4 and placed in a futon, sleeping with the feet touched or approached, the static electricity of the human body is erased, The blood flow of the part of the body that is in contact with or close to the conductive wood A is improved, and the body feels warm, and at the same time it has the effect of being able to sleep well while improving sleep.

  Further, when this conductive wood A is used after being compressed to about ½, there are advantages such as increased hardness and less damage. Further, as shown in FIG. 5, this conductive wood is arranged with a large number of small-diameter conductive woods A in a flat shape, and these are covered with a sheet 10 to form a mat 11, which is placed under the back or waist. It can also be used. Further, as shown in FIG. 6, a large number of conductive woods A having a small diameter can be arranged in a ring shape, and a cushion material 12 can be inserted in the center to be used as a pillow 13. Also, as shown in FIG. 7, if the conductive wood A is cut into a circle and suspended from the neck as a pendant 14, the pendant 14 can be attached to remove static electricity charged on the human body. Furthermore, when the conductive wood A used for the pendant 14 of FIG. 7 is used as a key holder, when the key is inserted into an automobile or the like, static electricity can be prevented from flowing and becoming tedious.

  In addition, as described above, an adsorbing effect is exerted on the conductive material by the space formed inside the annular conductive material formed in each conduit. This conductive material can adsorb and fix moisture in the air, odorous substances coming from the human body, and harmful substances that cause sick house syndrome in the room.

It is a schematic structure front view of the pressure tank of the manufacturing apparatus of this invention. It is a schematic structure side view of the pressure tank of the manufacturing apparatus of this invention. It is a schematic sectional drawing of the state which put the wood of the to-be-processed object, and the aqueous solution of an electrically conductive material in the container used for manufacture of this invention. It is a perspective view which shows the usage example of the electrically conductive wood of this invention. It is a perspective view which shows the usage example of the electrically conductive wood of this invention. It is a perspective view which shows the usage example of the electrically conductive wood of this invention. It is a perspective view which shows the usage example of the electrically conductive wood of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wood 2 Container 3 Pressure tank 4 Rail 5 Heater 6 Exhaust pipe 7 Chemical solution injection pipe 8 Pressurized pipe 10 Sheet 11 Mat 12 Cushion material 13 Pillow 14 Pendant

Claims (8)

  As a conductive material on wood, antistatic agent, ionic conductive agent, ultrafine metal powder, fine metal fiber, ultrafine metal oxide powder, conductive carbon and carbon nanotube, fullerene, vegetable extract containing mineral, wood ash containing mineral A conductive wood characterized by impregnating an aqueous solution or aqueous dispersion composed of one or a plurality of extraction liquids and curing and holding the conductive material in at least a part of the wood conduit.   2. The conductive wood according to claim 1, wherein a surfactant is added as an auxiliary agent to the aqueous solution or aqueous dispersion.   The conductive wood according to claim 1 or 2, wherein one or more of a water-soluble polymer, a polymer emulsion, and a natural polymer are added as a retaining agent to the aqueous solution or aqueous dispersion.   The conductive wood according to claim 1, 2 or 3, wherein borax or boric acid is added to the aqueous solution or aqueous dispersion.   The conductive wood according to claim 1, 2, 3 or 4, wherein a solution obtained by dissolving chitin chitosan in 1 to 3% wood vinegar is added to the aqueous solution or water dispersion.   Monomers were added to the aqueous solution or aqueous dispersion, impregnated into wood, poured and dried, and then a curing agent and a crosslinking agent were poured into the wood to polymerize, solidify and fix them inside the conduit. The conductive wood according to claim 1, 2, 3, 4 or 5.   Put the wood to be treated into a pressure tank, depressurize while heating the inside of the pressure tank, and then return the inside of the pressure tank to normal pressure, and the wood in the pressure tank is an aqueous solution of a conductive material. Alternatively, the method for producing a conductive wood according to any one of claims 1 to 6, wherein the method comprises dipping in an aqueous dispersion, pressurizing the pressure tank in this state, and then drying the wood.   A pressure tank in which the container can be carried in is provided, and the wood that is the object to be treated is stored in the container that can be carried in the pressure tank, and an aqueous solution or dispersion of a conductive material can be poured into the container in the pressure tank. The pressure tank is provided with a device for depressurizing the pressure tank, a device for pressurizing the pressure tank, and a heating device for heating the container. An apparatus for producing conductive wood used in the described method.

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