JPH0820008A - Timber treating agent and modified treated timber - Google Patents

Abstract

PURPOSE:To provide a water base timber treating agent which can heighten water absorption resistance, moisture absorption resistance, and dimensional stability without damaging excellent performance and working property which are peculiar to a timber, and can maintain its effect for a long time. CONSTITUTION:A timber treating agent contains a water emulsion (O/W type) obtained by emulsifying an oil material by a cationic surface active agent. Accordingly, the emulsion can be impregnated up to the insides of pores at the central part regardless of kind of a timber and it can be held in the pores stably, so that water absorption resistance, moisture absorption resistance, and dimensional stability can be excellent for a long time. Further, by mixing a known timber modifier, it is also possible to give a desired quality to the timber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to wood treatment for improving water and moisture absorption resistance of wood, dimensional stability, and safety from use to disposal, and particularly a treatment agent therefor. And wood treated with the above-mentioned chemicals.

[0002]

2. Description of the Related Art Wood has long been used for building materials, musical instruments, furniture, structural materials and the like. Some of these wood products have been functioning for a long time of more than 1,000 years, and some of them have decayed within a year.

The durability of such wood greatly varies depending on its water content. In an environment where moisture absorption and drying are repeated, warping, distortion, cracking, etc. occur due to expansion and contraction, and it cannot withstand long-term use. In addition, in an environment where the water content is constantly high, not only the strength is reduced, but also the decay phenomenon is significantly accelerated. Therefore, in places with high humidity or where dry and high humidity are repeated, improving the water absorption and moisture absorption resistance of wood to maintain dimensional stability will improve the reliability and durability of wood products. That is extremely important.

[0004] Conventionally, in order to improve the water absorption resistance / moisture absorption resistance and dimensional stability of wood, "Changing Wood", edited by The Japan Wood Research Society, 19
91.1.20, Kaiseisha, and "Chemistry of Wood Utilization", 1983.3.
1. Various wood treating agents and wood treating methods were used as described in Kyoritsu Shuppan. Next, the representative ones are listed.

A treatment method of impregnating wood with a water-soluble treatment agent containing a polyhydric alcohol (such as polyethylene glycol) while soaking or pressurizing.

Since polyethylene glycol and the like are water-soluble, they penetrate into the interior of the wood while replacing the water in the wood. Then it is dried to obtain treated wood with a certain water content. This method is used for the preservation of wooden cultural properties excavated from the soil and for wooden products such as general furniture that are stored indoors.

A treatment method in which a wood is impregnated with a treatment agent prepared by dissolving a synthetic polymer such as a phenol resin in an organic solvent while dipping or pressurizing.

In this method, when the organic solvent is volatilized after impregnation with the treating agent, a composite of the synthetic polymer and wood is formed.

A method of acetylating the hydroxyl groups contained in wood by impregnating with acetic anhydride.

Specifically, acetic anhydride or acetic anhydride dissolved in a solvent other than water is impregnated into wood by dipping or pressurization, and then acetic anhydride is washed off with water or neutralized with an alkali to acetylate. Wood is obtained.

A method of formalizing hydroxyl groups contained in wood in formaldehyde vapor.

In this method, the wood is first treated with a dilute acid and then placed in formaldehyde vapor.
Formalizes the surface of wood.

More recently, the following wood treating agent and wood treating method have been disclosed in Japanese Patent Application Laid-Open No. 5-69412.

A method of injecting a known water-soluble modifier for wood with resin emulsion into wood.

The present method relates to a wood treatment agent containing a water-soluble modifier for wood and a resin emulsion as active ingredients, and a wood treatment method of injecting the treatment agent into wood while pressurizing the wood treatment agent. The injected treating agent penetrates through the pores of the wood. Then, when this is dried, the polymer component dispersed in the resin emulsion is deposited at the pore openings on the surface layer of the wood, a film is formed and the openings are blocked, and the water-soluble modifier is enclosed in the pores. It is kept in a stable state by being cut off from the outside air.

Further, the modified wood is cut,
Even if the surface is damaged, the resin emulsion encapsulated inside is promptly deposited at a new opening, formed into a film, and then sealed again.

The resin emulsion has an average particle size of 300 nm or less, a glass transition temperature of −40 to + 40 ° C.,
When a resin having a dissolution rate in water after drying of 10% or less is used, the function of blocking the wood pore openings by the film formation of the resin emulsion is more effectively exhibited, and the most preferable one is the following general formula: A meta (acrylic) acid ester represented by (a) and the following general formulas (b-1), (b-2) and (b)
It is described as a copolymer emulsion obtained by copolymerizing with a hydrophilic monomer selected from the group consisting of -3).

[0018]

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[0019]

However, each of the above-mentioned methods has the following problems.
In the method of injecting a treatment agent consisting only of a water-soluble substance such as the one described above, cracks and distortions are likely to occur due to evaporation of water during drying, and the treatment agent is washed out by rainwater etc., and the effect decreases with time. .

In the above, there is a problem in safety during processing due to toxicity, volatility and flammability of the organic solvent.

Further, the acetylation method of (1) has been put to practical use since it is only a laboratory technique because the cost is too high because the process is complicated. Further, since the acetic acid or sodium acetate remains in the wood, the treated wood is deteriorated.

The method of formalization of (1) uses an acid catalyst, so that the quality of wood is remarkably deteriorated, and there is a problem in the safety during the treatment due to the toxicity and odor of formalin. Further, since it is a method of permeating steam only from the surface of wood, it is difficult to formalize it to the center.

On the other hand, since the processing agent is a high molecular weight resin, the viscosity of the processing agent itself is very high as shown in Table 1 of JP-A-5-69412. For this reason, it is possible to inject to the center of a tree species wood that has thick conduits (100 to 400 μm) such as South Sea wood atopins, Kempus, etc. and closes the conduits, but thin temporary conduits ( It is impossible to completely inject into the center of coniferous wood which has only 4 to 30 μm).

However, from the viewpoint of environmental protection on a global scale internationally, there is a situation in which tropical rainforests or forests in subtropical regions are protected, and it is apt to avoid cutting trees from these regions. Therefore, it has been desired to use a coniferous tree, which easily grows in Japan and relatively quickly grows, in place of the South Sea tree.

However, as described above, the coniferous tree has a thin temporary conduit and is difficult to be impregnated up to the center with the conventional treatment agent, so that cracks and the like are likely to occur during treatment, and the service life is short, so that it is still in practical use. Not in.

Therefore, the present invention solves the above-mentioned drawbacks of the prior art and improves water and moisture absorption resistance and dimensional stability without impairing the excellent performance and processing characteristics originally possessed by wood. It is an object of the present invention to provide a water-based wood treating agent and a treated wood which can enhance the effect and maintain the effect for a long time. Further, it is an object of the present invention to provide a wood treating agent and a treated wood capable of completely impregnating even a central part of a soft coniferous wood of a temporary conduit.

[0027]

In view of the above-mentioned object, as a result of intensive research, the present inventors have found that an aqueous emulsion of an oily substance can uniformly penetrate into the pores of wood and is stable. They found that they were retained, and completed the present invention.

That is, the present invention relates to a wood treating agent containing an aqueous emulsion (O / W type) of an oily substance (claim 1,
Hereinafter referred to as the basic treatment composition). Aqueous emulsions of oily substances that exert such functions include hydrocarbons, synthetic esters, animal and vegetable oils and fats, such as cationic surfactants, anionic surfactants, amphoteric surfactants, nonionic surfactants, etc. It is a stable emulsion of a surfactant. It should be noted that claims 2 to 6 show preferred embodiments based on the constitution of the basic treatment agent of the present invention.

The present invention also relates to a vacuum degassed wood,
The present invention relates to treated wood, characterized in that pores in the wood obtained by injecting the wood treatment agent into the wood while pressurizing the wood treatment agent are impregnated with the wood treatment agent (claim 7). This treated wood has excellent water and moisture absorption resistance and dimensional stability. Claims 8 to 9 show further preferred embodiments thereof.

[0030]

In the present invention, the oily substance means a substance generally called "oil", that is, a substance which is not dissolved in water, and a substance which is liquid at room temperature is preferable. For example, hydrocarbons, animal and vegetable oils and fats, esters and the like are preferably applied. It should be noted that there is no idea to apply a polymer to the oily substance in the present invention, and the molecular weight is about 2000 at the maximum. If it exceeds 2000, the viscosity becomes high and the size of the molecule becomes large, so that it becomes difficult to impregnate the treatment liquid into pores and cells such as temporary conduits, which is not suitable.

More specifically, examples of the oily substance applicable to the present invention include animal and vegetable fats and oils such as beef tallow, lard, rice oil, corn oil, rapeseed oil, linseed oil, soybean oil, beeswax, wax and carnauba wax. , Candelilla wax, jojoba oil, etc.

Although hydrocarbons include aliphatic hydrocarbons and aromatic hydrocarbons, those which are volatile at room temperature and atmospheric pressure are not preferred. That is, those having a boiling point of 300 ° C. or higher are preferable, and liquid paraffin, petrolatum, paraffin wax, microcrystalline wax and the like can be mentioned.

Synthetic esters include tributyl phosphate, dibutyl phthalate, butyl oleate and di-2 sebacate.
-Ethylhexyl, diethylene glycol dibenzoate, tributyl acetyl citrate and the like. Among the above oily substances, vegetable oils and fats have a good affinity with wood and are particularly preferable in terms of cost. Furthermore, the problem of resource depletion does not occur in vegetable oils and fats, and the wood treatment agent of the present invention can be stably supplied.

An aqueous emulsion of an oily substance is a dispersion of the above oily substance in water. The particle size of the emulsion to be impregnated is not particularly limited, but may be such that the stability as a formulation can be maintained and is not more than the pore size of the wood to be treated. From this viewpoint, the particle diameter is generally about 5 μm or less, more preferably 2 μm or less, and particularly preferably 1 μm or less.

In order to prepare a stable emulsion, it is preferable to emulsify with a surfactant, and a known surfactant generally used at the time of emulsification may be used. In particular, a cationic surfactant is used. preferable. Because the wood tissue exhibits an anionic property, the impregnated wood treatment agent of the present invention is ionically bonded to the wood tissue and can be more stably maintained in the wood for a long period of time. The service life is improved. Further, since the cationic surfactant has an antiseptic action, it is preferable to select the cationic surfactant also in this respect. However, a nonionic surfactant, an amphoteric surfactant or an anionic surfactant may be used alone or in combination.

For the above reasons, it is preferable to use an emulsion obtained by further emulsifying a nonionic surfactant or an amphoteric surfactant to which a cationic surfactant is added, because the same effect as described above can be obtained.

When used in combination with a known wood modifying agent as described below, a cationic surfactant may be used for the purpose of expecting an antiseptic effect in the modifying agent, so that an anion is used. Use caution when using surfactants. This is because, in this case, the cationic surfactant in the modifier and the anionic surfactant in the emulsion bond to break the emulsion.

A particularly preferred combination of the oily substance and the surfactant of the wood treatment agent of the present invention is, for example, a combination of a vegetable oil and fat with a cationic surfactant or an active agent mixture containing a cationic surfactant.

In the wood treating agent of the present invention, 1 to 80% by weight of the total weight of the treating agent is preferably added as an oily substance, more preferably 3 to 20% by weight. 1
If less than 80% by weight, the effect of uniform impregnation does not appear, and 80% by weight
When it exceeds the limit, oily substances will be leached on the wood surface,
Not preferred.

When wood is treated using the wood treatment agent of the present invention, the treatment agent is evenly distributed to the central portion of not only thick broad-leaved trees with conduits but also thin coniferous trees with temporary conduits.
One of the main reasons is that the impregnating substance is an aqueous emulsion in which an oily substance is finely dispersed. Furthermore, the injected oily substance is retained in the wood for a long period of time, especially in the conduit or temporary conduit, more preferably in the soft cells, so that the obtained treated wood is resistant to water absorption / moisture absorption and dimensional stability. Exerts an extremely excellent effect on.
In addition, the impregnation integrity is that the impregnation extends completely up to the center of the wood, and the uniformity of impregnation underlies the homogeneity of the treated wood.

The wood treatment agent of the present invention comprises the above-mentioned aqueous emulsion of the oily substance, and further wood modification such as known dimension stabilizers, preservatives, insect repellents, flame retardants and dyes depending on the purpose. Agents can also be included. The wood modifier is more preferably an aqueous one from the viewpoints of safety, handleability, and emulsion stability. Further, as the oily substance used in the present invention, there is an advantage that a safe substance as described above, particularly, an environmentally and hygienically safe substance can be used.

Examples of the dimensional stabilizer include glycols such as ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol and polypropylene glycol, partial esterified products thereof, polyethylene glycol mono (meth) acrylate, saturated polyester resin and polyglycol. (Meth) acrylic acid esters, urethane resins, polyvinyl alcohol, vinyl acetate copolymers and the like can be mentioned.

Examples of preservatives include copper compounds, chromium compounds, arsenic compounds, boron compounds, pentachlorophenol, naphthenic acid metal salts, organotin compounds, chloronaphthalic acid, 8-quinolinol copper, captans, creosote oil, Examples include Wolmans, chromized zinc chloride, formalin and the like. When using these, preferably
From these, select one that is harmless to the environment and hygiene.

Examples of the insect repellent include Wolman salt, polydene salt, organophosphorus compound, carbamate compound, organotin compound, chlordane, heptachlordildrin, aldrin, thiodane, γ-BHC (1,2,3,3).
4,5,6-hexachlorocyclohexane), 1,1,
1-trichloro-2,2-bis (p-chlorophenyl)
Ethane, 1,1,1-trichloro-2,2-bis (p-
Methoxyphenyl) ethane, toxaphene, kebon, sulfonamides, thiophenes, organic thiocyanates and the like can be mentioned.

Examples of the flame retardant include inorganic water-soluble salts such as diammonium hydrogen phosphate and boric acid, sulfamate salts, halogen compounds, compounds containing phosphorus and nitrogen, guanidine compounds, and metal oxides such as antimony oxide. The thing etc. are mentioned.

Examples of dyeing agents include direct dyes, acid dyes,
Examples thereof include basic dyes. Further, alcohol-soluble dyes or oil-soluble dyes can be used if they are solubilized in water by adding a dyeing aid or a surfactant.

Further, when the wood treating agent of the present invention mixed with other wood modifying agent is used, the above wood modifying agent can be spread to the center of the wood together with the emulsion of the oily substance according to the present invention. In addition to water and moisture absorption resistance and dimensional stability, it is possible to impart desired properties to the treated wood.

Next, the usage form of the wood treating agent of the present invention will be described. The wood treating agent of the present invention is used by impregnating the inside of wood in the same manner as a known wood treating agent or wood modifying agent. At this time, it is preferable that the treatment agent is uniformly impregnated at least in the conduit in the case of hardwood and in the temporary conduit in the case of softwood. Furthermore, it is particularly preferable that the cells such as radioparenchyma crossing the conduit or the temporary conduit are also impregnated.

Examples of the impregnation method include a method of injecting and impregnating wood with the treatment agent of the present invention under the action of pressure such as normal pressure, reduced pressure or pressure, or under a predetermined pressure history including normal pressure.
Examples thereof include a method in which the treatment agent of the present invention is applied to the surface of wood by a brush or a roll coater so as to permeate the inside thereof, and a method of immersing wood in the treatment agent of the present invention to impregnate the inside thereof.

Among these, the treatment method is preferable, and the treatment agent can be impregnated into the pores of the whole wood relatively easily and reliably. Furthermore, it is particularly preferable to follow the method of Japanese Patent Application No. 5-23752 already filed by the applicant.

In this method, (a) a decompression step of decompressing the wood to be treated to remove gas in the wood, (b) then applying the wood to a predetermined pressure at which the wood is not deformed. An initial pressurizing step of pressing and holding the pressure for a predetermined time
(C) A pre-pressurization step of stepwise increasing the pressure to the final pressurization pressure after the pressure holding time has elapsed, and pressurizing the wood while maintaining the pressure for a predetermined time in each pressurizing step,
(D) A treatment liquid injection step of injecting the treatment liquid into the wood at a predetermined treatment liquid injection pressure.

By using the above method, the treating agent can be easily impregnated to the inside of the wood structure and the entire wood without deforming the wood to be treated. Furthermore,
It is uniformly impregnated and impregnated from any direction, regardless of the grain or grain of the wood to be treated. Therefore, the treated wood in which the treating agent of the present invention is injected and impregnated by the method has a greater effect on water absorption / moisture absorption resistance, dimensional stability and the like.

By the way, conifers are generally shown in FIGS.
In order to inject the treatment liquid to the central part, it is necessary to destroy the radial parenchymal cell wall and the pair of occluding wall pores.

Here, the closed wall hole pair will be described. The wall hole pairs 1 having the structure shown in FIG. 4 are scattered between the cells of the wood,
A wall hole 2 is formed. At the center of the wall hole 2, there is a thickened portion called "ruth", and the surrounding area is a thin mesh shape (margot). This is because the wall hole wall is attracted to one of the hole openings in the process of forming the core material and the truth 3 becomes the wall hole 2.
The one that has a shape that closes is called a pair of closed wall holes.

In this method, the pressure applied to the treated wood is gradually increased from a low pressure, so that the pressure difference between the inside and the outside of the wood is sufficient to destroy the truth 3, but the wood is deformed. This is a method in which the truth 3 is gradually destroyed to the center of the material, and then the treatment liquid is injected to sufficiently permeate the treatment liquid into the wood.

That is, first, the outermost radial parenchymal cell wall and the pair of closed wall holes are destroyed to equalize the external pressure with the pressure in the temporary conduit 21a. Then, the temporary conduits 21b and 21c are repeatedly destroyed to pressurize the core material so that the pressure becomes equal to the external pressure. In this case, the pressure is propagated through very fine cuts and small holes, so it is necessary to raise the pressure for efficiency, but a rapid rise causes material erosion and deformation. Therefore, the pressure increase is performed step by step.

In each stage, the pressure is maintained for a predetermined period of time and the pressure in that stage is reached until the inside of the wood reaches the pressure in that stage, and the pressure treatment in the next stage is performed. The holding time in each pressure step is preferably relatively long up to about 15 kg / cm ^{2 for} 10 minutes or more, but after that, it may be shorter than that.

The pressure in the initial pressurizing step, the pressure difference at the stage, and the holding time may be set to various values depending on the material and size of the wood. If the pressure difference is large and it takes time to reach an equal pressure inside the wood, it is necessary to lengthen the holding time.

Next, the process liquid injection step is performed. In this treatment liquid injection step, the treatment liquid is injected and penetrated into the wood to be treated under a constant pressure. In this case, the gas remaining in the temporary wood conduit 21 is taken into the pressurized processing solution according to Henry's law. The processing pressure may be the same as the final pressurizing pressure subsequent to the preliminary pressurizing step, or may be a different pressure separately. Also,
By the pre-pressurization step, the radial parenchymal cell wall and the pair of closed wall pores have already been destroyed to the inside of the wood, so the treatment solution easily penetrates into the interior of the wood, so it is possible to treat at a pressure lower than the conventional treatment solution injection pressure. It is possible.

On the other hand, after injecting the treatment liquid under pressure, it is necessary to depressurize the pressurized state. In this case, if the pressure is suddenly released, the gas taken into the processing liquid due to Henry's law may expand rapidly, which may destroy the wood itself. For this reason, in particular, a decompression tank is provided in the processing apparatus, and this is preliminarily pressurized with gas to eliminate the pressure difference from the pressure container in which the wood to be treated is stored. Then, by gradually releasing the pressure from the decompression tank via the decompression valve, the gas dissolved in the processing liquid is released first. In this case, the gas dissolved in the treatment liquid flows out from the wood earlier than the treatment liquid because of its small molecular weight, and as a result, the treatment liquid remains inside the wood.

As described above, according to the pouring method, the pair of closed wall holes are destroyed and the wood treating agent of the present invention is injected therein, so that the wood treating agent can easily flow into the adjacent temporary conduit. Moreover, the cell wall itself can be destroyed, and the treatment agent can be spread to the inside of cells such as radial parenchymal cells. Therefore, according to this method, regardless of the grain or grain of the wood to be treated, it can be uniformly impregnated and impregnated from any direction, and the treatment agent can be impregnated to the inside of the wood and the entire wood. This method is particularly preferably applied to the treatment of softwood.

On the other hand, a hardwood generally has a conduit for conducting water unlike the above-mentioned softwood, but this conduit contains a large amount of impurities such as tylose. Blockages and hinders the injection of processing solution.

Therefore, in this method, in the initial pressurizing step, pressurization is performed for a long time at a pressure (for example, 1.5 kg / cm ² ) which is lower than that in the case of softwood and which does not cause clogging. Therefore, it is preferable that the pressure is evenly propagated to the center of the wood so that the treatment liquid is injected to the center. In the pre-pressurization step, since the number of conduit elements is large, it is possible to pressurize without having the multi-stage as in the case of softwood.

The wood to be treated to which the wood treatment agent of the present invention is applied can be applied to all kinds of wood, regardless of whether it is hardwood or softwood. For example, in coniferous trees, there are cedar, Akamatsu, Kuromatsu, Karamatsu, Ezomatsu, Toga, cypress, Sawara, Tohi, Ichii, Asunaro, and in hardwoods, makanba, beech, oak, maple, shinanoki, umami, sen. , Oak, shiiki, cherry, tochigi, paulownia, katsura, lauan, mahogany, atopin, agaschi, teak, rosewood, ebony. However, it is epoch-making that the treatment agent of the present invention can be sufficiently spread to the inside even in the case of a softwood which cannot be impregnated to the center with the conventional treatment agent.

The shape of the applied wood is not limited as long as the skin is scraped off, and further, plywood,
It may be processed wood such as laminated wood, particle board, fiber board, or the like.

[0066]

EXAMPLES The present invention will be described in more detail below with reference to examples. However, these merely show specific embodiments of the present invention, and the present invention is by no means limited to the following examples. In the following examples, "%" means "% by weight" unless otherwise specified.

<Example 1> Stability test against water 1) 100 x 100 x 50 m from one Akita cedar (core holding, water content 50%) of 105 x 105 x 3000 mm
A test material of m was prepared, and each wood treating agent having the composition shown in Table 1 was adjusted to the concentration at the time of use, and then injected.

(A) As a depressurizing step, the wood to be treated is hermetically stored in a pressure vessel, and as shown in FIG.
Reduce the pressure to 0 mmHg and hold for about 20 minutes to remove the air contained in the wood as much as possible.

(B) As an initial pressing step, the wood to be treated is pressurized to 2 kg / cm ² and held for about 20 minutes. Pressurization of ² kg / cm ² is sufficient to destroy the individual substances such as truth, and this retention does not destroy the radial parenchymal cell wall or the pair of obstruction wall pores, but the partial destruction causes the pressure to increase during this retention time. It propagates to the center.

C) Next, the pre-pressurizing step is performed. As shown in Fig. 1 (b), the initial pressurizing step is 2 kg / cm.
Starting from ^{2, the} pressure is increased stepwise to the final pressurization pressure. Generally, Truth is 2-5kg / depending on the type of wood
It is destroyed by applying a pressure of cm ² to it. That is, due to the relative pressure difference between the inside and outside of the wood that occurs at the beginning of each stage, the radial parenchymal cell wall, the closed wall hole pair, and the like are successively destroyed to the inside of the wood.

2) In the step of injecting the treatment liquid, the wood treating agent having a predetermined concentration was injected at the same pressure as the final pressurizing pressure and 25 kg / cm ² .

[0072]

[Table 1]

2) Cure at room temperature for 1 week. 3) Measure the tangential dimension (post-curing dimension) of the test material after curing. 4) One cycle of immersion in water (24 hours) and heating at 60 ° C. (24 hours) is repeated, and immersion and heating are repeated. At this time, the dimension in the tangential direction (dimension after loading) was measured each time one cycle was completed, and the rate of dimensional change was obtained by the following formula I. In addition, the occurrence of cracks was also observed.

[0074]

[Equation 1]

[0075]

[Table 2]

The results are shown in Table 2 above. The treated wood injected with the wood treatment agent of the present invention does not crack even in an environment where high humidity and high temperature drying are repeated, the dimensional change rate is 1% or less, and sufficient durability is exhibited. showed that.

<Example 2> Intermittent heating test 1) 100 x 100 x 50 m from one Akita cedar (core holding, moisture content 50%) of 105 x 105 x 3000 mm
The test material of m was prepared and each wood treating agent having the composition shown in Table 3 was adjusted to the in-use concentration.
It was injected in the same manner as in ~ 2).

2) Cure at room temperature for 1 week. 3) Measure the tangential dimension (post-curing dimension) of the test material after curing.

4) Heat drying at 60 ° C. for 8 hours / day in a thermostatic chamber, and measure the dimension in the tangential direction (dimension after loading) with time, and obtain the dimensional change rate from the formula I in Example 1. . In addition, the occurrence of cracks was also observed.

[0080]

[Table 3]

[0081]

[Table 4]

The results are shown in Table 4 above. The treated wood injected with the wood treatment agent of the present invention has excellent dimensional stability even under high temperature drying, and does not crack.

<Example 3> 1) A 300 x 300 x 2000 mm piece of Akita cedar (core holding, water content 50%) was used as a test material, and the wood treating agent of the present invention example was used. Injection was carried out by the same operation as in Examples 1) to 2), and the mixture was cured at room temperature for 1 week.

2) The above wood was cut longitudinally and indirect measurement was performed on its components. As a result, it was confirmed that the treatment agent was impregnated up to the center of the wood. Further, the degree of impregnation was uniform both in the central part and the peripheral part.

[0085]

EFFECTS OF THE INVENTION The wood treatment agent of the present invention can impregnate all wood regardless of the type of wood with the treatment agent even in the pores in the central portion, and stably retain the pores in the pores. Therefore, it is excellent in water absorption / moisture absorption resistance and dimensional stability over a long period of time. Furthermore, the wood treating agent of the present invention containing a known wood modifier is used to impregnate the modifier evenly to the center, and therefore, in addition to water and moisture absorption resistance and dimensional stability, desired properties Can be given.

Further, the treated wood agent of the present invention is excellent in water absorption / moisture absorption resistance and dimensional stability because the wood treatment agent is impregnated in the entire pores of wood. Further, it is possible to provide a wood imparted with properties such as antiseptic properties, insect proof properties, flame retardancy and the like, and it is also possible to provide a wood dyed in a desired color, depending on the purpose.

The treated wood can be used in any durable manner, and is useful for civil engineering, building materials, furniture, general structural materials and the like. It is especially suitable for piles, stanchions, or rail sleepers.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a manner of depressurizing and pressurizing wood to be treated prior to a treatment liquid injection step in a method of injecting a wood treating agent into wood to be treated (softwood).
(A) is an explanatory view showing the relationship between the depressurizing force and the holding time in the depressurizing step, and (b) is an explanatory view showing the relationship between the pressing force and the holding time in the initial pressurizing step and the preliminary pressurizing step. Is.

FIG. 2 is a schematic diagram showing the internal tissue structure of a conifer.

FIG. 3 is a schematic diagram showing a tissue structure of a cross section inside a coniferous tree.

FIG. 4 is a schematic diagram showing the appearance of wall pores between coniferous wood tissues.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Koichi Matsumoto 3-20 Tsukimidai, Hodogaya-ku, Yokohama-shi, Kanagawa Prefecture (72) Inventor, Yashiko Hariko 1-1-16 Yukinoshita, Kamakura-shi, Kanagawa Yasakaso 202

Claims (9)

[Claims] 1. An aqueous emulsion of an oily substance (O / W type)
A wood treating agent comprising: 2. The wood treating agent according to claim 1, wherein the aqueous emulsion is prepared by emulsifying with a surfactant. 3. The wood treating agent according to claim 2, wherein the surfactant is a cationic surfactant. 4. The oily substance is a hydrocarbon, a synthetic ester,
The wood treatment agent according to any one of claims 1 to 3, which is at least one selected from animal and vegetable oils and fats. 5. The wood treating agent according to claim 1, wherein the oily substance is contained in an amount of 1 to 80% by weight based on the total weight of the wood treating agent. 6. The wood treating agent according to claim 1, further comprising a wood modifier. 7. Inside the pores in the wood obtained by injecting the wood treatment agent according to any one of claims 1 to 6 into the wood while pressurizing the wood which has been degassed in vacuum. Treated wood is impregnated with the wood treatment agent. 8. The treated wood according to claim 7, wherein at least the interior of the conduit or the temporary conduit of the wood is uniformly impregnated with the wood treating agent according to any one of claims 1 to 6. 9. The treated wood according to claim 8, wherein the wood treatment agent according to any one of claims 1 to 6 is also impregnated into soft cells of the wood.