JPH0569412A - Lumber treating agent and lumber treating method - Google Patents

Abstract

PURPOSE:To provide a lumber modifying agent and a modifying method capable of continuing an excellent modified effect for a long time by preventing the leakage of a modifying agent caused by rain water or the like in a method wherein a modifying agent is infected into fine holes of lumber to modifying dimensional stability, or a preservative property, an anti-water absorbing and moisture absorbing property, an ant-proofing property and the like, however, since the modifying agent leaks due to rain water or the like and therefore the modified effect is reduced and lost in a short time in the case of using a water soluble modifying agent. CONSTITUTION:There is disclosed a lumber treating agent and a lumber treating method wherein the former contains a water soluble modifying agent for lumber and resin emulsion as an effective component. Particularly, when an emulsion of an average particle diameter of 300mm or less, a glass-transition temperature of -40-+40 deg.C, and an elution rate of 10% or less to water after drying is used, an enclosing operation to the lumber fine hole openings by the film creation of resin emulsion is performed more excellently and thereby continuity of the modified effect can further be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to the water and moisture absorption resistance of wood,
The present invention relates to a treating agent and a treating method for improving dimensional stability, antiseptic property, anti-termite property and the like.

[0002]

2. Description of the Related Art Wood expands and contracts due to increase or decrease in water content.
It contracts, causing warpage, distortion, cracking, and the like. Moreover, when the content increases, not only does the strength decrease, but also the decay phenomenon is significantly accelerated. Therefore, it is extremely important to improve the water absorption and moisture absorption resistance of wood to improve dimensional stability and decay resistance, or to improve the termite resistance and the like, in order to improve the reliability and durability of wood products.

Under these circumstances, methods for modifying wood have been studied, for example, a method of injecting a water-soluble preservative, an anti-termite agent, a dimensional stabilizer, etc. into wood, and a method of combining wood and plastic. , A method of modifying wood by treating it with a phenol resin, an acetylating agent, a formalizing agent, etc. has been proposed. Wood is polyethylene glycol (P
The method of treating with EG) is also one of the wood modification methods. This PEG modified wood is commonly used for furniture in the United States, and it is also used as an interior material for houses and offices and ski materials in Japan. Has been done.

[0004] Further, as a literature regarding stabilization of wood,
For example, "Wood Industry Handbook" (June 3, 1982)
Published by Maruzen Co., Ltd. on page 0, 455-474,
Alternatively, "Chemistry of Wood Utilization" (March 1, 1983, published by Kyoritsu Shuppan Co., Ltd.), pages 256 to 283, etc., these methods include a waterproof and moisture-proof treatment method for enhancing dimensional stability; phenol resin, An impregnation modification method using PEG, a vinyl resin, etc .; a modification method using acetic anhydride (acetylation), formaldehyde (formalization), and the like are described.

[0005]

Solvent-based treatment agents using organic solvents have safety problems, and water-based wood treatment agents are desired. However, in the method of injecting the water-soluble wood treating agent, cracking and distortion are likely to occur during drying, and the treating agent is gradually washed out by rainwater and the like, so that the modifying effect is gradually reduced.

Further, the formalization treatment method causes significant deterioration of the wood and cannot avoid the formalin odor because it is treated with a strong acid. It has the drawback of being altered. Further, in the method of combining with a plastic agent, the excellent workability and heat insulating property of wood are likely to deteriorate, and the combining work is complicated and the cost is high. Further, PEG-treated wood has a drawback that it easily absorbs moisture and is difficult to dehumidify.

The present invention has been made in view of the above drawbacks of the prior art, and its object is to maintain dimensional stability, preservatives, and termite resistance while maintaining excellent workability of wood. It is intended to provide a water-based wood treatment agent and a wood treatment method capable of imparting the above-mentioned properties for a long time.

[0008]

The constitution of a wood treating agent according to the present invention, which has been able to solve the above problems, has a gist of containing a water-soluble modifier for wood and a resin emulsion as active ingredients. is there. The above-mentioned resin emulsion is used as a blocking agent for stably holding the water-soluble modifier for wood in the pores of wood as described below. Particle size is 300nm or less, glass transition temperature is -40 to +
It is preferable to use one having an elution amount of 10% or less in water in a dry state at 40 ° C. As a constituent material of the resin emulsion, a preferable emulsion is a copolymer emulsion obtained by copolymerizing a polymerizable monomer mixture containing the following monomers (A) and (B) in a predetermined amount.

(A): (meta) represented by the following general formula (a)
One or more acrylates: 40-9
9.9% by weight,

[0010]

[Chemical 3]

(B): The following general formulas (b-1), (b-2)
And one or more hydrophilic monomers selected from the group represented by (b-3): 0.1 to 15% by weight.

[0012]

[Chemical 4]

When the above wood treating material is pressure-injected into the wood under a reduced pressure atmosphere, the water-soluble modifier for wood penetrates into the pores of the wood, and the resin emulsion is dried to form a film on the wood surface side. And enclose the above modifier in the wood pores,
It is possible to obtain a modified wood that has a long-lasting modifying effect.

[0014]

The water-soluble modifier for wood used in the present invention is not a special one, and includes various known water-soluble wood modifiers. Specific examples thereof will be described in detail later. Stabilizers, preservatives, insect repellents, flame retardants, dyes and the like are included. The difficulty pointed out when using these as a wood modifier is as described above, but the biggest difficulty is that the modifier gradually flows out due to rainwater etc. and loses the modifying effect,
Alternatively, depending on its type, the moisture absorption resistance and dehumidification resistance are rather impaired by the additive injected into the wood pores.

Therefore, in the present invention, a resin emulsion is used in combination with a water-soluble modifier for wood as a means for solving these problems. That is, when wood is impregnated or coated with an aqueous liquid containing a water-soluble modifier and a resin emulsion, these penetrate into the interior through the pores (including conduits) 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 and formed into a film to block the openings and confine the water-soluble modifier in the pores. It becomes a state and holds these stably. As a result, the water-soluble modifier in the pores is shielded from the outside air, all the problems pointed out in the prior art are eliminated, and the excellent modifying effect can be maintained for a long period of time. When the modified wood is cut or the surface is scratched, unsealed pores open on the surface, but the resin emulsion is enclosed in the pores together with the water-soluble modifier. Since the resin emulsion is promptly deposited and film-formed at the new opening to block the opening, the effect of modification after cutting and scratching is not impaired.

As is clear from the above, the resin emulsion used in the present invention forms a film of a poorly water-soluble or insoluble liquid by penetrating into the wood pores together with the water-soluble modifier and drying. The one to be formed should be selected.
And in order to penetrate into the wood pores, the average particle size is 30
It is preferably 0 nm or less, and when it exceeds 300 nm, it becomes difficult to penetrate into the inside of the pores, and it becomes difficult to obtain the opening blocking effect particularly when the treated wood is cut. It is recommended that the thickness be 20 nm or more because of easy availability. Further, the elution rate of the film after drying with respect to water is preferably 10% by weight or less, and if the elution rate is too high, the resin emulsion component and the water-soluble modifier are likely to flow out from the wood surface due to rainwater, The sustainability of the modifying effect becomes poor.

Considering the processability and stain resistance of the treated wood, it is desirable to select a resin having a glass transition temperature of -40 to + 40 ° C. as the resin constituting the emulsion. The reason is that if the glass transition temperature is too low,
The film after drying becomes sticky, the resin sticks to the saw blade, etc., and dust tends to adhere to the surface of the processed wood.On the other hand, if the glass transition temperature is too high, the dried resin is the surface of the wood. It will look like it was blown away and the appearance will be poor.

The glass transition temperature (Tg) is the temperature at which the resin begins to change from a hard glassy state to a rubbery state when the temperature of the resin is gradually raised from the low temperature side, and this is determined by actual measurement. Besides it is, H ₁ is the structure factor of the _{resin, Х 2,} ... _Х when the glass transition temperature of _n is known as a homopolymer of each is their glass transition temperature _{(TgX 1, TgX 2, ...} TgX n ) Can be obtained by the following equation by the weight fraction method.

[0019]

[Equation 1]

The type of the resin emulsion used in the present invention is not particularly limited, but comprehensively the permeability into the wood pores, the pore blocking performance by film formation, the processability and surface characteristics of the treated wood, etc. From the standpoint of enhancing to (1), a preferable resin emulsion is (A) one or more kinds of (meth) acrylic acid ester represented by the above general formula (a): 40 to 99.9% by weight, and (B) the above general One or more hydrophilic monomers selected from the group consisting of formulas (b-1), (b-2) and (b-3): 0.1
It is a copolymer emulsion obtained by copolymerizing a polymerizable monomer mixture containing about 15% by weight.

Examples of the (meth) acrylic acid ester represented by the general formula (a) include methyl (meth) acrylate,
Ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, hexyl (meth) acrylate, 2-ethylhexyl acrylate, octyl (meth) acrylate, nonyl (meth) acrylate, (meth )
Examples include decyl acrylate, lauryl (meth) acrylate, and the like, and if necessary, two or more kinds can be used in combination. This (meth) acrylic ester imparts appropriate flexibility to the resin that constitutes the emulsion to enhance the processability and physical properties of the treated wood, and therefore, its proportion in the polymerizable monomer mixture is 40 to 99.9. It is desirable to set it in the range of weight%.

Next, the hydrophilic monomer defined in the above (B) has the function of enhancing the stability of the resin emulsion and facilitating the penetration of the resin into the pores of the wood having hydrophilicity. As shown in the above general formulas (b-1), (b-2) and (b-3), various polymerizable monomers having a carboxyl group or a hydroxyl group in the molecule are used. As a concrete example,
(Meth) acrylic acid, fumaric acid, maleic acid, (meth)
Examples thereof include acrylamide, N-methylol (meth) acrylamide, and 2-hydroxyethyl (meth) acrylate. These may be used alone or 2
You may use together 1 or more types. The proportion of these hydrophilic monomers in the total amount of the monomer mixture is preferably 0.1 to 15% by weight, more preferably 1 to 10% by weight. Below this range, a stable resin emulsion can be obtained. On the other hand, if it is too large, the resin emulsion will thicken and the permeability to the wood pores will deteriorate, or the elution rate of the film-forming film into water will increase, and the effect of blocking the pore openings will be sufficient. It becomes difficult to be demonstrated.

The above-mentioned monomer mixture may further contain other polymerizable monomers (C) such as ethylene, butadiene, vinyl acetate, vinyl propionate, styrene, α-methylstyrene, vinyltoluene, vinyl chloride, etc. One or more non-cross-linking monomers and cross-linking monomers such as glycidyl (meth) acrylate may be contained. However, if the amount of these other polymerized monomers (C) is too large, the balance of weather resistance and flexibility of the obtained resin will be deteriorated, so the ratio in the total monomer mixture should not exceed 55% by weight. It is good to do like this.

The method for producing the resin emulsion is not particularly limited, but the most general method is emulsion polymerization in an aqueous solvent. After copolymerization by a method other than emulsion polymerization,
It is of course possible to obtain an emulsion by emulsifying in an aqueous solvent. In this case, it is also effective to use a small amount of an emulsifier, a protective colloid or the like, if necessary.

Next, the water-soluble modifier used by mixing with the above resin emulsion includes all kinds of water-soluble modifiers used for wood modification, and typical ones are as follows. Examples include dimension stabilizers, antiseptics, insect repellents, termites, flame retardants, dyes and the like.

As the dimensional stabilizer, ethylene glycol, diethylene glycol, triethylene glycol,
Glycols such as polyethylene glycol and polypropylene glycol, or partial esterified products thereof, polyethylene glycol mono (meth) acrylate, saturated polyester resins, poly (meth) acrylic acid esters, urethane resins, polyvinyl alcohol, vinyl acetate copolymers, etc. It is illustrated.

Examples of preservatives include copper compounds, chromium compounds, arsenic compounds, boron compounds, pentachlorophenol, naphthenic acid metal salts, organic tin compounds, chloronaphthalene compounds, 8-quinolinol copper, captans, creosote oil, Wolmans, chromized zinc chloride, formalin and the like can be mentioned.

As the insect repellent, for example, Wolman salt, polydene salt, organic phosphorus compound, carbamate compound,
Organotin compounds, chlordane, heptachlortildrin, aldrin, thiodane, γ-BHC (1,2,
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, toxaphen, kebon, sulfonamides, thiophenes , Organic thiocyanates and the like.

Examples of the flame retardant include inorganic water-soluble salts such as diammonium hydrogen phosphate and boric acid, sulfamic acid salts, halogen compounds, compounds containing phosphorus and nitrogen, guanidine compounds, and metal oxides such as antimony oxide. Things etc. are mentioned. Examples of the dyeing agent include direct dyes, acid dyes, basic dyes, or alcohol-soluble dyes or oil-soluble dyes, which are solubilized in water by adding a dyeing aid or a surfactant.

The wood treating method using the wood treating agent thus obtained includes a method in which the treating agent is dropped into the wood to be treated under normal pressure, reduced pressure or pressure, and a method for applying the treatment liquid with a brush or a roll coater. Examples of the method include spray coating, and a method of immersing wood in a treatment agent to impregnate it. However, in order to allow the treatment agent to penetrate deep into the deep pores of wood, atmospheric pressure, reduced pressure, or pressure is preferable. This is a method of impregnating the treated wood with the treating agent by immersing it under pressure. Among these, particularly preferable is, for example, JP-A-1-29.
No. 7204 describes a method in which a treatment agent is pressure-injected into the pores while degassing the air in the pores by vacuuming the treated wood in a sealed container. According to the method, even if the wood to be treated has a relatively large size, the treatment agent can be injected into the interior in a short time. After the injection is completed, the treated product is dried at room temperature or, if necessary, dried with warm air. As described above, the resin emulsion precipitates at the openings of the wood pores, forms a film, and closes the openings. The treatment agent can be enclosed in the. Even when this treated wood is cut, it is necessary to immediately deposit the resin emulsion encapsulated inside the cut surface or the opening of the pores opened in the wound, form a film, and seal the opening. As explained.

There is no limitation on the wood to which the present invention is applied. For example, cedar, Akamatsu, Kuromatsu, Karamatsu, Ezomatsu, Hamamatsu, Toga,
Coniferous trees such as cypress, sawara, spruce, ichii, asunaro, makanba, beech, oak, maple, shinanoki, 楡, sen, kunugi,
Oara, shiiki, cherry, tochigi, paulownia, katsura, lauan, mahogany, atopin, kempus, agaschi, teak, oak,
All hardwood such as rosewood and ebony are applicable.
Further, the shape thereof may be any shape such as a log, a veneer, a square or a plate, and may be a processed wood such as plywood or laminated wood, particle board or fiber board.

[0032]

EXAMPLES Examples and comparative examples of the present invention will be shown below, but the present invention is not limited to the following examples. In the following, "part" and "%" are based on weight unless otherwise specified. The test methods and measurement methods used in the examples are as follows. <Measurement of non-volatile content> About 1 g of the emulsion was weighed in an aluminum dish of known weight, dried in a hot air dryer at 105 ° C for 2 hours, cooled, and then dried in the aluminum dish, and the weight was measured. Calculate the non-volatile content. Nonvolatile matter (%) = [(weight after drying-weight of aluminum dish) / weight of emulsion] x 100

<Measurement of Viscosity> The container containing the emulsion was left in a constant temperature bath at 25 ° C. for 2 hours or more, and the viscosity was measured by a Brookfield type rotational viscometer (manufactured by Tokyo Keiki Co., Ltd .; BM type, rotation speed 30 rpm). To measure.

<Measurement of average particle size> Submicron particle size analyzer (Nozaki Sangyo Co., Ltd., “NICOMP Model
370 ").

<Measurement of Elution Rate of Resin After Drying> After the emulsion is dried at room temperature on an aluminum dish, about 5 g of the resin is accurately weighed and placed in a cylindrical filter paper, and Soxhlet extraction with water is performed for 5 hours. The obtained extract is dried, the residue is measured, and the dissolution rate is calculated by the following formula. Dissolution rate (%) = (dry residue of extract / initial resin weight) x 1
00

<Resin Impregnation Test> 500 g of a wood treating agent was placed in a 600 ml glass container, and 5 × 5 × 8 was added thereto.
Put a cm piece of wood (Kempus material) in a vacuum pump for 200T
After reducing the pressure to orr and holding for 5 minutes, the pressure is released to allow the wood treating agent to penetrate into the wood. After taking out this test piece and observing the surface of the wood mouth, it is dried for 1 day in a dryer at 50 ° C. This test piece is cut at a distance of 2 cm from the wood mouth, the distribution state of the resin is observed with a microscope (50 times), and the quality of impregnability is evaluated according to the following criteria. ◯: There is almost no resin in the mouth after injection, and the resin is evenly infiltrated into the cut surface after drying. Δ: A small amount of resin was observed at the mouth after injection, and the resin was unevenly distributed on the cut surface after drying. X: A large amount of resin is observed in the wood mouth after injection, and almost no resin is observed in the cut surface after drying.

<Processability test of resin-impregnated wood> 500 g of wood treating agent was put in a 600 ml glass container, and 5 x
Put a piece of wood (Kempus material) of 5 x 8 cm and use a vacuum pump to do 2
After reducing the pressure to 00 Torr and holding for 20 minutes, the pressure is released to allow the treatment agent to penetrate into the wood. After taking out this test piece and drying it in a dryer at 50 ° C for 1 day, the resistance when cutting 1 cm from the wood mouth with a saw is compared with the resistance when cutting the untreated material according to the following criteria. evaluate. ◯: Almost the same ease of cutting. Δ: Somewhat difficult to cut. X: Saw is attached and very difficult to cut.

<Outflow Prevention Performance Test> 500 g of a wood treating agent was put in a 600 ml glass container, and 5 × 5 × 8 cm
Put a piece of wood (Kempus material) in a vacuum pump for 200To
After depressurizing to rr and holding for 20 minutes, decompressing and infiltrating the wood treatment agent into the wood to take out this test piece and drying it at room temperature for 7 days, and then the obtained dried piece was put into 200 ml of ion exchange water. Immerse for 1 week, quantify the amount of ethylene glycol eluted in immersion water by liquid chromatography,
Evaluate according to the following criteria. A: Eluted ethylene glycol is 10% of the theoretical injection amount
Less than. ◯: Eluted ethylene glycol is 10% of the theoretical injection amount
Above 20%. Δ: Eluted ethylene glycol is 20% of the theoretical injection amount
Above 50%. X: Eluted ethylene glycol is 50% of the theoretical injection amount
that's all.

Example 1 In a reaction vessel equipped with a stirrer, a reflux condenser, a thermometer, a nitrogen inlet tube and a dropping funnel, 180 parts of deionized water and "Hitenol N-08" (polyoxyethylene nonylphenyl ammonium sulfate; 1 part (manufactured by Ichigo Seiyaku Co., Ltd.) and 0.5 part of ammonium persulfate were charged and heated to an internal temperature of 8
Set to 0 ° C. In this, 216 parts of methyl methacrylate,
2 parts ethyl hexyl acrylate, 172 parts acrylic acid 4
Part, "Hitenol N-08" (same as above), 8 parts of "Nonipol 200" (polyoxyethylene nonyl phenyl ether; Sanyo Chemical Co., Ltd.) and 160 parts of deionized water, and a monomer emulsion. 3 parts of a 10% aqueous solution of ammonium persulfate and 3 parts of a 5% aqueous solution of sodium bisulfite are each flowed in over 3 hours. After the end of the inflow, the mixture is kept at the same temperature and stirred for 2 hours. After that, add 50
After cooling to below 0 ° C, a 25% aqueous ammonia solution is added dropwise to adjust the pH to 8. Then, after cooling, the contents were taken out through an 80-mesh filter and the nonvolatile content was 50:
%, Viscosity: 1300 cps, average particle size: 150 nm,
A theoretical Tg: O ° C resin emulsion was obtained. This is designated as resin emulsion (A). To 200 g of this resin emulsion (A), 200 g of ethylene glycol and 6 parts of water
00g was added and stirred to obtain a wood treating agent (1). When each performance evaluation of the obtained wood treatment agent (1) was performed, as shown in Table 1, it was good in all the items.

Example 2 A reaction vessel equipped with a stirrer, a reflux condenser, a thermometer, a nitrogen inlet tube and a dropping funnel was charged with 180 parts of deionized water, 1 part of "HITENOL N-08" (same as above) and ammonium persulfate. Charge 0.5 part and heat to bring the internal temperature to 80 ° C.
In this, 280 parts of butyl acrylate, styrene 116
Emulsion, 4 parts of acrylic acid, 1 part of "HITENOL N-08" (same as above), 8 parts of "Nonipol 200" (same as above) and 160 parts of deionized water, and 10 parts of ammonium persulfate. % Aqueous solution and 3 parts 5% aqueous sodium bisulfite solution are each allowed to flow in for 3 hours. After the end of the inflow, the mixture is kept at the same temperature and stirred for 2 hours.
Then, the reaction solution is cooled to 50 ° C. or lower, and then 25% aqueous ammonia solution is added to adjust the pH to 8. Then, after cooling, the content was taken out through a 80-mesh filter to obtain a resin emulsion having a nonvolatile content of 50%, a viscosity of 80 cps, an average particle diameter of 200 nm, and a theoretical Tg of -30 ° C. This is designated as resin emulsion (B). To 200 g of this resin emulsion (B), 200 g of ethylene glycol and 600 g of water were added and stirred to obtain a wood treating agent (2). When each performance evaluation of the obtained wood treatment agent (2) was carried out, as shown in Table 1, all the items were good.

Comparative Example 1 200 g of ethylene glycol and 800 g of water were stirred and mixed to obtain a comparative wood treating agent (1), and each performance evaluation was carried out. The sustainability of quality effects cannot be expected at all.

Reference Example 1 180 parts of deionized water, 1 part of "Hitenol N-08" (same as above) and ammonium persulfate were placed in a reaction vessel equipped with a stirrer, a reflux condenser, a thermometer, a nitrogen introducing tube and a dropping funnel. 0.5 part is charged and the temperature is raised to 80 ° C. In this, 396 parts of butyl acrylate, 4 parts of acrylic acid,
A monomer emulsion consisting of 1 part of "Hitenol N-08" (same as above), 8 parts of "Nonipol 200" (same as above) and 160 parts of deionized water, 3 parts of a 10% aqueous solution of ammonium persulfate and hydrogen sulfite. 3 parts of a 5% aqueous solution of sodium are passed in over 3 hours each. After the end of the inflow, the mixture is kept at the same temperature and stirred for 2 hours. Then, after cooling the reaction solution to 50 ° C. or lower, a 25% aqueous ammonia solution is added to p
Adjust to H8. Then, after cooling, the contents were taken out through an 80-mesh filter, nonvolatile content: 50%, viscosity: 1500 cps, average particle size: 150 nm, theoretical T
g: A resin emulsion having a temperature of −55 ° C. was obtained. This is designated as resin emulsion (C). This resin emulsion (C)
200g ethylene glycol 200g and water 600g
Was added and stirred to obtain a wood treating agent (3). When the properties of the obtained wood treatment agent (3) were evaluated, as shown in Table 1, the resin constituting the emulsion had a glass transition temperature that was too low, so that cutting with a saw was somewhat difficult.

Reference Example 2 A reaction vessel equipped with a stirrer, a reflux condenser, a thermometer, a nitrogen inlet tube and a dropping funnel was charged with 180 parts of deionized water and 0.5 part of ammonium persulfate and heated to an internal temperature. 80 ℃
To In this, 216 parts of methyl methacrylate, 172 parts of 2-ethylhexyl acrylate, 4 parts of acrylic acid,
A monomer emulsion consisting of 1 part of "Hitenol N-08" (same as above), 9 parts of "Nonipol 200" (same as above) and 159 parts of deionized water, 3 parts of 10% aqueous solution of ammonium persulfate and hydrogen sulfite. 3 parts of a 5% aqueous solution of sodium are passed in over 3 hours each. After the end of the inflow, the mixture is kept at the same temperature and stirred for 2 hours. Then, after cooling the reaction solution to 50 ° C. or lower, a 25% aqueous ammonia solution is added to p
Adjust to H8. Then, after cooling, the contents were taken out through an 80-mesh filter, nonvolatile content: 50%, viscosity: 100 cps, average particle size: 400 nm, theoretical T
g: A resin emulsion of O ° C. was obtained. This is designated as resin emulsion (D). This resin emulsion (D) 20
200 g of ethylene glycol and 600 g of water were added to 0 g and stirred to obtain a wood treating agent (4). Each performance evaluation of the obtained wood treatment agent (4) was carried out, and as shown in Table 1, the average particle size of the resin constituting the emulsion was a little too large, so that each resin hardly penetrated into the wood pores. It was confirmed that a part of the resin was aggregated at the mouth end and it was difficult to impregnate the inside of the pores.

Reference Example 3 In a reaction vessel equipped with a stirrer, a reflux condenser, a thermometer, a nitrogen inlet tube and a dropping funnel, 220 parts of deionized water, 1 part of "HITENOL N-08" (same as above) and an excess of water were added. 0.5 part of ammonium sulfate is charged and heated to bring the internal temperature to 80 ° C.
In this, 40 parts of methyl methacrylate, 260 parts of 2-ethylhexyl acrylate, 80 parts of acrylic acid, 6 parts of "Hitenol N-08" (same as above), "Nonipol 200"
(Same as above) 3 parts of a monomer emulsion consisting of 3 parts and 195 parts of deionized water, 3 parts of a 10% aqueous solution of ammonium persulfate and 3 parts of a 5% aqueous solution of sodium bisulfite, respectively.
Inflow over time. After the end of the inflow, the mixture is kept at the same temperature and stirred for 2 hours. Then, the reaction solution is cooled to 50 ° C. or lower, 25% aqueous ammonia solution is added to adjust the pH to 8, and the mixture is stirred for 30 minutes while further cooling. After stirring, remove the contents through an 80 mesh filter,
A resin emulsion having a nonvolatile content of 50%, a viscosity of 20000 cps, an average particle diameter of 140 nm, and a theoretical Tg of 15 ° C. was obtained. This is designated as resin emulsion (E). Ethylene glycol 2 was added to 200 g of this resin emulsion (E).
00 g and 600 g of water were added and stirred to obtain a wood treating agent (5). Each performance evaluation of the obtained wood treatment agent (5) was carried out. As shown in Table 1, since the amount of hydrophilic monomer components in the resin constituting the emulsion was large, the water elution rate of the film-forming film was It was rather high, and the effect of preventing ethylene glycol from flowing out was insufficient.

Comparative Example 2 200 g of ethylene glycol, 500 g of 40% sodium polyacrylate (average molecular weight 4000) aqueous solution and 300 g of water were mixed by stirring to obtain a comparative wood treating agent (2).
When the performance of each of the obtained comparative wood treatment agents (2) was evaluated, as shown in Table 1, the flow-out during water immersion was remarkable, and the sustaining of the modifying effect could not be expected.

[0046]

[Table 1]

In the performance evaluation test shown in Table 1 and the like,
We have shown the case of using ethylene glycol as a water-soluble modifier for wood treatment. Ethylene glycol is one of the wood modifiers that causes remarkable runoff (elution), has high hygroscopicity, and is difficult to dehumidify. It is clear that the resin emulsion showing excellent action and effect in combination with ethylene glycol exhibits the same or higher action and effect even when used in combination with other various water-soluble modifiers.

Further, the resin emulsions shown in Reference Examples 1 to 3 lack one part of the preferable conditions defined in claim 2, but the kind and treatment of the water-soluble modifier. It is sufficiently practicable depending on the use and required characteristics of wood, and these are also included in the technical scope of the present invention.

[0049]

The present invention is constituted as described above, and by using a wood treating agent in which a water-soluble modifier for wood is mixed with a resin emulsion, the precipitation / formation accompanying drying of the resin emulsion is achieved. The water-soluble modifier can be enclosed in the wood pores by the effect of the membrane to close the pore openings, and the modification effect can be maintained for a long time.

Front page continuation (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location C08J 7/04 F 7258-4F (72) Inventor Tadashi Aono 1-1 Ofukacho, Kita-ku, Osaka-shi West Japan Passenger Iron Road Company (72) Inventor Nobuo Ikeda 207-44 Ojiji, Terauchi, Akita-shi Arkon Co., Ltd. (72) Kazuhiko Nakamura 5-8 Nishimitabicho, Suita-shi, Osaka Japan Catalysis Suita Works (72) Kenji Miyata, 5-8 Nishiomitabicho, Suita City, Osaka Prefecture, Japan In the Nippon Catalyst Suita Works

Claims (5)

[Claims] 1. A wood treating agent comprising a water-soluble modifier for wood and a resin emulsion as active ingredients. 2. The resin emulsion has an average particle diameter of 300.
The wood treatment agent according to claim 1, which has a glass transition temperature of -40 nm or less, a glass transition temperature of -40 to + 40 ° C, and an elution rate in water after drying of 10% or less. 3. The resin emulsion is a copolymer emulsion obtained by copolymerizing a polymerizable monomer mixture containing the following monomers (A) and (B) in a predetermined amount.
Wood treatment agent described. (A): one or more of (meth) acrylic acid ester represented by the following general formula (a): 40 to 99.9% by weight, (B): the following general formulas (b-1), (b-2) and (b-
One or more hydrophilic monomers selected from the group represented by 3): 0.1 to 15% by weight. [Chemical 2] 4. The polymerizable monomer mixture comprises monomers (A) and (B)
The wood treating agent according to claim 3, which contains 55% by weight or less of a polymerizable monomer (C) other than the above. 5. A method for treating wood, which comprises injecting the wood treatment agent according to any one of claims 1 to 4 into the wood while pressurizing the wood placed under a reduced pressure atmosphere.