JP3803836B2 - Method for preserving wood materials - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for preserving wood materials. More specifically, the present invention relates to a method for preserving wooden materials such as structures, buildings, wooden statues, furniture, ornaments, traditional crafts, and cultural properties in which the wood portions of the inner and outer surfaces are weakened or hollowed out.
[0002]
In the present invention, the weakened state is a state in which the chemical composition of cellulose, hemicellulose, lignin and the like, which are the main components of the cell wall, has changed significantly due to wood decay fungi and the like. A state of collapse or loss. Further, in the present invention, the hollow state means a state in which a large number of holes are generated due to worm-eaten or the like. In many years of woody materials, these conditions often occur simultaneously.
[0003]
[Prior art and problems to be solved by the invention]
Structures, structures, wooden figures, furniture, decorations, traditional crafts, cultural properties, etc. made of wood materials are weakened or hollowed out due to weathering, fungi, insect erosion, etc. Will not maintain its original form. For this reason, efforts have been made to repair and preserve it.
[0004]
Conventionally, for this purpose, an acrylic resin ethyl acetate solution, a toluene solution, an acrylic resin emulsion, or the like has been applied, dipped and filled into a woody material. However, when these are used, drying takes a long time, and since the affinity with weakened wood is inferior, the hue and appearance of the woody material change, and there are also problems in workability.
[0005]
An object of the present invention is to provide a method with good workability for preserving a weakened or hollow wooden material without changing the hue and appearance of the wooden material by using a resin solution having affinity with the wooden material. It is to be.
[0006]
[Means for Solving the Problems]
The method for preserving a wood material according to the present invention is characterized in that an alcohol solution of polyvinyl butyral is infiltrated into a weakened or hollow wood material.
[0007]
Another preservation treatment method of the present invention is characterized in that an alcohol solution of polyvinyl butyral and ethyl cellulose is infiltrated into a weakened or hollow wooden material.
[0008]
In order to preserve the hollow wooden material, at least one selected from the group consisting of pulp powder, wood powder, glass powder, abrasive powder and crystalline cellulose and a polyvinyl butyral alcohol solution or polyvinyl Fill a mixture of butyral and ethylcellulose with an alcohol solution.
[0009]
In order to preserve the hollow wood material, the hollow portion of the wood material is filled with at least one selected from the group consisting of pulp powder, wood powder, glass powder, abrasive powder and crystalline cellulose, and from above, An alcohol solution of polyvinyl butyral or an alcohol solution of polyvinyl butyral and ethyl cellulose may be infiltrated.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The wood material according to the present invention refers to a wide wood material and is not particularly limited. However, for wood used in Buddhist statue sculpture and ancient architecture, cypress, kayak, camphor, zelkova, etc. are listed as typical tree species.
[0011]
The polyvinyl butyral used in the present invention may be commercially available and is not particularly limited, but is preferably soluble in alcohol and having an OH group content of 20 to 40 mol%. Moreover, a butyral degree of 60-75 mol% and an acetyl group content of 0-5 mol% are preferable.
[0012]
The ethyl cellulose used in the present invention may be commercially available and is not particularly limited, but the viscosity of a 5 wt% solution when dissolved in a mixed solvent of toluene / ethanol (weight ratio 8/2) is 10 to 10%. What is 50 cps is preferable.
[0013]
When ethyl cellulose is used in combination with polyvinyl butyral, the affinity with the wood fiber is further improved, and therefore, it is preferable to suppress the gloss of the wood material subjected to the storage treatment and prevent the appearance from changing. The mixing ratio of polyvinyl butyral and ethyl cellulose in the alcohol solution is preferably polyvinyl butyral: ethyl cellulose = 70 to 100: 30 to 0 by weight ratio.
[0014]
As alcohol used by this invention, a C1-C4 linear or branched alcohol is preferable. Examples of such alcohols include methanol, ethanol, isopropanol, propanol, butanol, isobutanol and the like, which are used alone or in a mixed state. Of these, ethanol is preferred.
[0015]
The concentration of polyvinyl butyral alone or a mixture with ethyl cellulose in the alcohol solution is preferably 3 to 30% by weight. If the concentration is less than 3% by weight, a sufficient preservation effect cannot be obtained, and if the concentration exceeds 30% by weight, the workability is poor.
[0016]
In the preservation treatment method of the present invention, a brittle or hollow wooden material is infiltrated with an alcohol solution of polyvinyl butyral or an alcohol solution of polyvinyl butyral and ethyl cellulose. That is, the entire weakened or hollow wood material is directly immersed in the solution, or the solution is poured into a necessary portion, or applied and then dried and cured. The solution penetrates the wood material sufficiently in a very short time. Drying is preferably performed at room temperature until a constant weight is reached.
[0017]
In addition, when treating a wood material that has been hollowed out due to corrosion, insect erosion, etc., at least one selected from the group consisting of pulp powder, wood powder, glass powder, abrasive powder, and crystalline cellulose in the above alcohol solution After the mixture is adjusted to have a desired viscosity and filled into the cavity, it is dried and cured, thereby repairing the missing part and the cavity due to corrosion or insect erosion and the like, thereby stabilizing the form of the woody material. When processing a hollow wood material, the hollow portion of the wood material is filled with at least one selected from the group consisting of pulp powder, wood powder, glass powder, abrasive powder and crystalline cellulose. From above, by applying or injecting the above-mentioned alcohol solution and infiltrating it, drying and curing can repair missing parts and cavities due to corrosion or insect erosion and stabilize the form of the woody material .
[0018]
Although the pulp powder used by this invention is not specifically limited, What grind | pulverized the pulp mechanically is preferable. Although it does not specifically limit as wood flour, What grind | pulverized the ground flour is preferable. Although it does not specifically limit as glass powder, The thing which grind | pulverized glass mechanically or atomized molten glass is preferable. The abrasive powder is not particularly limited, but is preferably a grindstone powder made by baking ocher, and is preferably used for coloring a coating base, pillar, plate, or the like. Crystalline cellulose is obtained by chemically treating cellulose and crystallizing it. Examples thereof include Avicel manufactured by Asahi Kasei Kogyo Co., Ltd. The average particle diameter of these pulp powder, wood powder, glass powder, abrasive powder and crystalline cellulose is preferably 5 to 100 μm. Among these powders, pulp powder, wood powder, and abrasive powder are preferable. A combination of pulp powder or wood powder and abrasive powder is also preferred. These pulp powder, wood powder, glass powder, abrasive powder and crystalline cellulose are preferably used in a weight ratio of pulp powder and the like: alcohol solution = 0.2 to 5: 1.
[0019]
In addition, in the wood material preserved by the method of the present invention, the cured resin composition or the like has reversibility because it can be dissolved and removed with the alcohol used in the treatment.
[0020]
A colorant, an antiseptic, a fungicide, an antibacterial agent and the like can be added to the alcohol solution used in the present invention or a mixture of the solution and pulp powder, if necessary.
[0021]
【Example】
EXAMPLES The present invention will be described in more detail with reference to examples below, but the present invention is not limited to these examples.
[0022]
Example 1
A cypress material 10.2 g (3.8 cm × 2.2 cm × 5.5 cm) completely weakened after about 1000 years was obtained from polyvinyl butyral resin (Surek Chemical Co., Ltd., ESREC BLS, OH group content) 9.2 g of commercially available ethylcellulose (0.8 g of a 5 wt% solution in a mixed solvent having a weight ratio of toluene / ethanol = 8/2) of 22 gps and methyl parahydroxybenzoate (antibacterial agent) 0 .1 g was immersed in a solution of 190 g of ethanol.
[0023]
The immersed cypress material absorbed the resin solution and settled in 10 minutes. When dipped for 60 minutes and then dried at 30 ° C. for 15 hours, the weight was 11.6 g and contained 12.1% by weight of resin or the like. The color tone of the cypress wood after the treatment was the same as that before the treatment. In addition, it was in a state that could sufficiently withstand further processing such as cutting, filling, and adhesion.
[0024]
Example 2
Polyvinyl butyral resin (Surek Chemical Co., Ltd., S-REC BXL, OH group content 37 mol%) 8.5 g, commercially available ethyl cellulose (weight ratio of toluene / ethanol = 8/2 mixed solvent 5 wt% solution) To a solution of 1.5 g of the viscosity of 18 cps) and 0.1 g of clove oil (antibacterial agent) dissolved in 190 g of ethanol, add 185 g of abrasive powder (average particle size 20 μm) and 15 g of pulp powder (average particle size 50 μm). A knead wood 60g (4.1cm x 2.4cm x 30.5cm) cavity which has many cavities due to worm-eating after about 800 years has passed after the kneaded material is placed in a conical wound polyester film. Part was filled and dried at room temperature.
[0025]
The total amount of the filler was 18.8 g, and there was no shrinkage of the dried cured product. A fragile portion around the hollow portion was treated by applying a resin solution containing neither abrasive powder nor pulp powder. The color tone of camphor wood after the treatment was almost the same as that before the treatment.
[0026]
Example 3
After about 1000 years, 30.7 g (3.7 cm x 2.8 cm x 31.1 cm) of kayak material having a cavity due to insect worms, 5 g of wood flour (average particle size 50 µm), glass powder (average particle size) (7 μm) 5 g and a mixed powder of 10 g of abrasive powder (average particle size 20 μm) were put, excess powder was removed with a brush, and 7.9 g of powder was filled. Next, from this, 30 g of a resin solution having the same composition as in Example 1 was applied and dried and cured to fix the filling. The treated product became constant in 72 hours, and the appearance did not change compared to before treatment. Moreover, the shrinkage | contraction of the dried hardened | cured material was not seen.
[0027]
Reference example 1
10.3 g (3.8 cm × 2.3 cm × 5.5 cm) of the same Japanese cypress material as in Example 1 was added to 10 g of polyvinyl butyral resin (Surek Chemical Co., Ltd., ESREC BXL, OH group content 37 mol%). And after being immersed in a solution of 0.1 g of methyl parahydroxybenzoate (antibacterial agent) in 190 g of ethanol for 60 minutes and then dried at 30 ° C. for 15 hours, the weight becomes 11.9 g, and 13.4% by weight of resin, etc. Contained. The appearance of the cypress wood after the treatment was higher in gloss than that using ethyl cellulose in combination. In addition, it was in a state that could sufficiently withstand further processing such as cutting, filling, and adhesion.
[0028]
【The invention's effect】
In the present invention, in order to process using a resin solution or resin composition having an affinity for the wood material, the weakened or hollow wood material is preserved without changing the hue or appearance of the wood material. be able to.

Claims (3)

A method for preserving a wood material, comprising impregnating a brittle or hollow wood material with an alcohol solution of polyvinyl butyral and ethyl cellulose. The cavity of the hollowing the wood material, pulp powder, wood powder, glass powder, filling a mixture of at least one and port polyvinyl butyral and ethyl cellulose alcohol solution selected from the group consisting of he says and crystalline cellulose A method for preserving wood materials characterized by the above. The cavity of the hollowing the wood material, pulp powder, wood powder, glass powder, he says, and is selected from the group consisting of crystalline cellulose filled with at least one alcohol solution thereon, positive polyvinyl butyral and ethylcellulose A method for preserving and treating woody materials, characterized by impregnating with water.