JPH06143205A - Manufacture of fungiproof wooden material - Google Patents

Abstract

PURPOSE:To inhibit fungal propagation of wooden material and to improve physical properties of its surface such as surface hardness, flaw resistance, etc. CONSTITUTION:Wooden material is impregnated with a treatment which is loaded with 10-30 pts.wt. of low shrinking agent and 0.5-1.0 pts.wt. of fungistat against 100 pts.wt. of solid content of resin fluid which consists of resin for wood-plastic composite, and, then, the material is heat-treated. Melamine resin, unsaturated polyester resin or, etc., is used as the resin for wood-plastic composite, and vinyl acetate or methyl methacrylate is used as low shrinking agent. As the fungistat, benzimidazole group compounds e.g. 2-(4-thiazoline) benzimidazole is used, and as a heat-treat, hot air is used and a flat press, etc., is used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the modification of wood, and more particularly to a method for producing antifungal wood materials.

[0002]

2. Description of the Related Art Conventionally, as an interior / exterior material for construction, a table, a counter, and a door made of wood have been widely used. In recent years, in particular, wood resources have been effectively utilized, Numerous modifications have been made to compensate for the various drawbacks of wood materials. Above all, mold that occurs on wood after construction and during storage not only impairs the appearance of the product, but may not be applicable as a material for molding processing,
(1) Disperse the antifungal agent in the paint for coating and then apply it on the surface of the wood material. (2) Inject synthetic resin into the wood material to form WPC. (3) Add the antifungal agent. Means such as impregnating wood with a drug dispersed in an aqueous solution and (4) dispersing an inorganic antibacterial agent in a synthetic resin and injecting it into a wood material to form WPC are widely used.

[0003]

[Problems to be Solved by the Invention]
(1) In the method of coating on the surface of the wood material, the fungus-proof property works effectively on the surface of the coating film, but when scratches up to the wood material below the coating film occur, its effect Is drastically reduced. Further, (2) by injecting a synthetic resin into the wood material, it is possible to impart a considerable antifungal property, but a mold may sometimes be generated in the cell wall where the high molecular weight synthetic resin is difficult to penetrate. , Cannot completely prevent mold. Further, (3) a method of impregnating a wood material with a chemical in which only an antifungal agent is dispersed in an aqueous solution is
It is difficult to improve the surface hardness compared to the one injected with synthetic resin. Further, (4) the method of dispersing an inorganic antibacterial agent in a synthetic resin and injecting it into a wood material has a drawback that particles of the inorganic antibacterial agent are difficult to inject into the cells of wood. In all cases, it was difficult to obtain a sufficient antifungal effect.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above situation, and a shrinkage reducing agent is added in an amount of 10 parts by weight with respect to 100 parts by weight of a solid content of a resin liquid containing a WPC resin.
The above-mentioned problems can be solved by injecting a treatment agent containing 30 to 30 parts by weight and 0.5 to 1.0 parts by weight of a fungicide into a wood material, and then performing heat treatment. . Hereinafter, the present invention will be described in detail.

As the WPC resin used in the present invention, resins used for WPC conversion of wood materials such as melamine resin, diallyl phthalate resin, unsaturated polyester resin, polyurethane resin and polymethylmethacrylate resin can be applied. If necessary, a curing agent, water, an organic solvent, a cross-linking agent, etc. are added to form a resin liquid, and the viscosity is appropriately adjusted depending on the wood material type, particularly the density and thickness.

As the melamine resin, melamine and formalin are subjected to a condensation reaction in the presence of an alkali catalyst,
A guanamine-modified melamine resin obtained by condensation reaction of guanamine such as acetoguanamine and benzoguanamine, melamine and formalin in the presence of an alkali catalyst, or a melamine resin in powder form dissolved in water can be applied.

The diallyl phthalate resin, the polyurethane resin and the polymethyl methacrylate are each a partially polymerized diallyl phthalate monomer, a polycondensed isocyanate and an alcohol by a conventional method.
What polymerized methyl methacrylate can be applied.

As the unsaturated polyester resin, those obtained by dehydration condensation using a polybasic acid and a polyhydric alcohol according to a conventionally known technique can be applied. Examples of the polybasic acid include maleic anhydride, fumaric acid, and anhydride. Phthalic acid, isophthalic acid, terephthalic acid, itaconic acid, etc.
Examples of the ethylene glycol, propylene glycol
, Neopentyl glycol, diethylene glycol,
Examples include dipropylene glycol and butylene glycol.

Examples of the low shrinkage agent include vinyl acetate.
, Acrylic acid, methyl acrylate, acrylamide,
Polymers such as acrylonitrile, styrene, methyl methacrylate, methacrylamide, and the like, WPC
In consideration of curing shrinkage of the resin for use, it can be appropriately selected and used as necessary. This is to prevent the occurrence of cracks and cracks in the surface layer portion due to the curing shrinkage of the WPC resin, and the addition amount is 100 parts by weight of the solid content of the resin liquid containing the WPC resin. The amount is preferably 10 to 30 parts by weight. If the upper limit is exceeded, the surface properties of the antifungal wood material, especially the surface hardness, will be poor, and if the lower limit is not reached, it will be difficult to suppress the curing shrinkage of the WPC resin and warp will occur easily.

Antifungal agents include organic sulfur compounds,
Examples include organic tin compounds, chlorophenyl compounds, benzimidazole compounds, etc., which have been conventionally known as industrial fungicides in terms of safety and effects.
Benzimidazole-based compounds, for example, 2- (4-thiazolyl) benzimidazole, methyl 2-benzimidazolecarbamate, fenofrazol, 1- (butylcarbamoyl) -2-benzimidazolecarbamate, etc. Is preferably used. At the time of use, one or more of these benzimidazole-based compounds are dissolved in an organic solvent such as methyl ethyl ketone or ethyl cellosolve by appropriately adding a surfactant, and used as the WPC resin. A resin liquid that is compatible with the resin liquid and the low-shrinking agent and that is not decomposed by the reaction heat generated when the WPC resin is cured can be appropriately selected and used.

The amount of benzimidazole compound added is
With respect to 100 parts by weight of the solid content of the resin liquid, 0.3 to 2.0 parts by weight, more preferably 0.5 to 1.
It is preferably 0 part by weight, and when the addition amount of the benzimidazole-based compound exceeds the upper limit, curing of the WPC resin is likely to be hindered, and discoloration upon irradiation with ultraviolet rays, so-called light resistance is poor, Also, if the lower limit is not satisfied, it is difficult to obtain sufficient antifungal properties.

Wood materials include raw materials, sliced veneer,
Examples include hardwood, beech, beech, rawan, poplar, capole, oak, sen, duck, zelkova, etc., cedar, red pine, larch, cypress, hemlock, hiba, enoki, Softwood materials such as red oak, laminated lumber, LVL (Laminated Veneer L)
However, the present invention is not limited to these.

The treating agent may be used even if the surface of the wood material is treated by spraying with a spray or coating with a flow coater. However, the injection method is preferable from the viewpoint of allowing more penetration into the wood material. For example, a dipping method, reduced pressure injection, pressure injection, or a method combining these injection methods can be applied. The impregnated amount of the mixed resin liquid is preferably 15 to 120% with respect to the wood material 100. If it is less than the lower limit, it is difficult to obtain antifungal property, and if it exceeds the upper limit, it becomes saturated, which is economically disadvantageous.

As means for curing the WPC resin,
Examples of the heat treatment include, but are not limited to, hot air heating, infrared heating, far infrared heating, and microwave heating. The heating temperature and the heating time may be such that the thermosetting resin is sufficiently cured and the wood material is not damaged,
The conditions of the heat treatment are slightly different depending on the composition of the mixed resin liquid and the curing agent, but it is preferably about 80 to 140 ° C. and 0.1 to 8 hours.

Further, a flat plate press, a continuous press or the like may be used to apply pressure simultaneously with heating. In this case, WP is used.
The curing of the C resin is promoted, and the strength becomes excellent. As the pressure when pressurizing, accelerate the curing of the resin,
It is desirable that it does not damage the wood material.
The condition of kg / cm ² is suitable.

[0016]

The method for producing an antifungal woody material of the present invention has a high antifungal effect by allowing an antifungal agent, particularly a benzimidazole compound, to infiltrate and fix the cell wall of the woody tissue in which the resin for WPC is hard to enter. The effect is obtained. Further, by curing the resin for WPC, the wood material is made into a plastic, and therefore it is possible to prevent volatilization and leaching of the benzimidazole-based compound from the wood material structure.

Further, if necessary, a low-shrinking agent is used in combination, so that the curing shrinkage of the WPC resin in the surface layer portion is suppressed, so that cracking, cracking and the like can be prevented. Therefore, it is possible to prevent the infiltration of water and mycelia, and it is possible to significantly suppress the generation of mold.

Furthermore, by using a hot press as a means for heating and curing the WPC resin, the surface of the wood material is compacted and the surface hardness can be improved.

[0019]

EXAMPLES Hereinafter, examples and comparative examples will be described in more detail. Example 1 As a resin for WPC, 2-hydroxyethyl methacrylate (light ester HO manufactured by Kyoeisha Yushi-Kagaku Kogyo)
Was used and benzoyl peroxide was added as a polymerization initiator thereto to obtain a resin liquid (A). Then, vinyl acetate polymer and 2- (4-thiazolyl) benzimidazole
2- (4-thiazolyl) benzimidazole solution in which ethyl is dissolved in ethyl cellosolve was added to the resin liquid (A) in an amount of 12 in terms of the solid content based on 100 parts by weight of the solid content.
The treating agent (a) was obtained by adding 0.6 part by weight. Then, the treatment agent (a) was injected under reduced pressure and pressure into a rubber tree having a water content of 7.6% so that the impregnation amount was 16.6%, and then 1
The mold-resistant woody material of Example 1 was obtained by heating and curing it at 20 ° C. for 8 hours.

Example 2 The treating agent (a) was injected under reduced pressure and pressure into a sesendoc with a water content of 8.1% so that the impregnation amount was 15.9%, and then 120
The composition was heat-cured at 8 ° C. for 8 hours to obtain the fungicidal wood material of Example 2.

Example 3 The treating agent (a) was injected under reduced pressure and pressure into a rubber tree having a water content of 7.2% so that the impregnation amount was 16.0%. 20 kg / cm ² , time 20
The mold-resistant woody material of Example 3 was obtained by heating and curing under pressure for minutes.

Example 4 As a resin for WPC, an unsaturated polyester resin (DIC
-CS101 manufactured by Dainippon Ink and Machinery Co., Ltd.,
A styrene monomer and a curing agent were added to this to obtain a resin liquid (B). Then, the vinyl acetate polymer and the 2- (4-thiazolyl) benzimidazole solution used in Example 1 were converted into solid content based on 100 parts by weight of the solid content of the resin liquid (B). 20 parts by weight and 0.6 parts by weight were added to obtain a treating agent (b). Then, water content 7.
The amount of impregnated treatment agent (b) in 1% of rubber tree is 15.9%
The mixture was injected under reduced pressure and pressure so as to obtain the following, and then heat-cured at 120 ° C. for 8 hours to obtain the mold-resistant woody material of Example 4.

Example 5 The treating agent (b) was injected under reduced pressure and pressure into a Sesendoc with a water content of 8.2% so that the impregnation amount was 15.7%, and then 120
The mold-proof wood material of Example 5 was obtained by heating and curing under conditions of 8 ° C. and 8 hours.

Example 6 The treatment agent (b) was injected under reduced pressure and pressure into a rubber tree having a water content of 7.0% so that the impregnation amount was 16.7%. 20 kg / cm ² , time 20
Example 6 was carried out by heat curing while applying pressure under the condition of minutes.
The mold-resistant woody material was obtained.

Example 7 Polymethylmethacrylate and the 2- (4-thiazolyl) benzimidazole solution used in Example 1 were converted into solid content based on 100 parts by weight of the solid content of the resin liquid (B). Value of 28 parts by weight and 0.6 parts by weight of treating agent (c)
Got Then, after injecting the treating agent (c) into the rubber tree having a water content of 7.1% under reduced pressure and pressure so that the impregnation amount becomes 15.9%, it was heated and cured under the conditions of 120 ° C. and 8 hours. Mold-free woody material of No. 7 was obtained.

Example 8 The treatment agent (c) was injected under reduced pressure and pressure into a rubber tree having a water content of 7.1% so that the impregnation amount was 18.6%. 20 kg / cm ² , time 20
Example 8 was carried out by heat curing while applying pressure under the condition of minutes.
The mold-resistant woody material was obtained.

Comparative Example 1 The resin liquid (A) was injected into a rubber tree of the same quality as in Example 1 under reduced pressure and pressure so that the impregnation amount was 17.7%, and then heat curing was performed under the same conditions as in Example 1. The treated wood of Comparative Example 1 was obtained.

Comparative Example 2 Vinyl acetate polymer and the 2- (4-thiazolyl) benzimidazole solution used in Example 1 were added to 100 parts by weight of the solid content of the resin liquid (B) to obtain a solid content. Treated agent (d) by adding 7.0 parts by weight and 0.2 part by weight, respectively, in converted value
Got Then, the treatment agent (d) was injected under reduced pressure and pressure into a rubber tree having a water content of 7.3% so that the impregnation amount was 14.3%, and then heat-cured at 120 ° C. for 8 hours to obtain a comparative example. 2 treated wood was obtained.

Comparative Example 3 Vinyl acetate polymer and the 2- (4-thiazolyl) benzimidazole solution used in Example 1 were added to 100 parts by weight of the solid content of the resin liquid (B) to obtain a solid content. Treated agent (e) by adding 7.0 parts by weight and 2.0 parts by weight as converted values, respectively.
Got Then, the treating agent (e) was injected under reduced pressure and pressure into a rubber tree having a water content of 7.3% so that the impregnation amount became 15.0%, and then heat-cured at 120 ° C. for 8 hours to obtain a comparative example. A treated wood of 3 was obtained.

Comparative Example 4 The vinyl acetate polymer and the 2- (4-thiazolyl) benzimidazole solution used in Example 1 were added to 100 parts by weight of the solid content of the resin liquid (B) to obtain a solid content. The conversion agent was added in an amount of 35 parts by weight and 0.2 parts by weight, respectively, to obtain a treating agent (f). Then, the treatment agent (f) was injected under reduced pressure and pressure into a rubber tree having a water content of 7.4% so that the impregnation amount was 15.8%, and then heat-cured at 120 ° C. for 8 hours to obtain a comparative example. A treated wood of 4 was obtained.

Comparative Example 5 A vinyl acetate polymer and the 2- (4-thiazolyl) benzimidazole solution used in Example 1 were added to 100 parts by weight of the solid content of the resin liquid (B) to obtain a solid content. The treating agent (g) was obtained by adding 35 parts by weight and 2.0 parts by weight in terms of converted values. Then, the treatment agent (g) was injected under reduced pressure and pressure into a rubber tree having a water content of 6.8% so that the impregnated amount was 15.8%, and then heat-cured at 120 ° C. for 8 hours to obtain a comparative example. A treated wood of 5 was obtained.

Comparative Example 6 The 2- (4-thiazolyl) benzimidazole solution used in Example 1 was dissolved in 100 parts by weight of distilled water in an amount of 1.0 parts by weight in terms of solid content to disinfect. An aqueous solution was obtained. Next, a bactericidal aqueous solution was injected under reduced pressure and pressure into a rubber tree having a water content of 6.6%, followed by heating and drying to obtain treated wood of Comparative Example 6.

Comparative Example 7 Untreated rubber tree was used as the untreated wood of Comparative Example 7.

The evaluation results are shown in Table 1.

[Table 1]

The evaluation method was as follows. For mold resistance, 400 cm ² (length 20 cm x width 20 c
m), the surface of the test piece having a thickness of 28 mm was cut with a knife to make a scratch with a depth of 1.0 to 1.8 mm in a grid pattern, and then a cloth soaked with water was covered thereon, and then the temperature was measured. After leaving it in a thermo-hygrostat at 40 ° C. and a relative humidity of 90% for 10 days, it was taken out and visually checked for the presence of mold. The case where no mold was generated was evaluated as ◯, the case where mold was generated in the scratched part was evaluated as Δ, and the case where mold was generated on the entire surface was evaluated as x.

Regarding the surface Brinell hardness, JISZ2
Based on 117, a steel ball with a diameter of 10 mm is 1 / πm on the surface.
The hardness at the time of press-fitting was measured. Unit: [kgf / mm
² ]

Regarding the warp, the length is 1000 mm and the width is 4
After preparing a test piece having a thickness of 50 mm and a thickness of 28 mm and treating it in a thermo-hygrostat at 40 ° C.-90% (relative humidity) -48 hours and subsequently at 40 ° C.-30% (relative humidity) -48 hours. Measure the warp in the concave warp direction of 0.1 or more ~
Those having a length of less than 0.5 mm were evaluated as ◯, those having a value of 0.5 to less than 1.0 mm were evaluated as Δ, and those having a value of 1.0 mm or more were evaluated as x.

Regarding the light resistance, according to JIS K6902, after irradiating with ultraviolet rays for 48 hours, JIS Z8722
Then, the color difference (ΔE) was measured.

[0040]

According to the production method of the present invention, a benzimidazole-based compound exhibiting high stability to heat, a resin for WPC, and, if necessary, a low-shrinking agent are added to a wood material. By injecting a treatment agent and heat-treating, it is possible to suppress the growth of mold such as mildew, black mold, and blue mold, and to improve surface physical properties such as surface hardness and scratch resistance.

Claims (3)

[Claims] 1. A solid content 1 of a resin liquid comprising a WPC resin.
A treating agent containing 10 to 30 parts by weight of a shrinkage reducing agent and 0.5 to 1.0 parts by weight of an antifungal agent is added to 00 parts by weight of wood and then heat-treated. A method for producing an antifungal wood material characterized by the following. 2. The method for producing an antifungal wood material according to claim 1, wherein the antifungal agent is a benzimidazole compound. 3. The method for producing a fungicidal wood material according to claim 1, wherein the heat treatment is accompanied by pressurizing operation.