JPH04296507A - Manufacture of resin reinforced lumber, and resin reinforced lumber - Google Patents

Abstract

PURPOSE:To provide a manufacture of improving an increase of weight and a quality feeling of the surface which have not been avoided so far and caused by the fact that upon manufacturing resin reinforced lumber, conventionally generally polymeric resin is forcedly penetrated into lumber from its surface as a method of impregnating polymeric resin, and thereby the impregnation quantity can not be controlled with result that the whole part of lumber to be objected is unnecessarily impregnated with resin. CONSTITUTION:A cylindrical hollow part is formed in the fiber direction of lumber and polymeric resin is injected therein and, by the use of a centrifuge, the lumber is rotated and, by making use of centrifugal forces, resin liquid does not penetrate from the hollow inner wall surface, and thereafter the resin is polymerically cured, whereby the impregnation quantity becomes possible to be controlled and, besides, an unnecessary increase of weight becomes possible to be restrained, moreover, since the lumber is not impregnated with resin liquid, the quality feeling is not damaged, so that the use thereof can be expanded even in either field of high quality articles or wide application articles.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing resin-reinforced wood in which wood is treated with a resin to improve its mechanical strength, and to a resin-reinforced wood.

0002

[Prior Art] A resin treatment is carried out in which wood is impregnated or injected with vinyl monomers and prepolymers such as methacrylic acid esters and styrene, and polymerizable resin liquids such as unsaturated polyester, and these are polymerized and solidified within the wood. It is known to obtain resin-reinforced wood by applying.

[0003] Furthermore, in this prior art, as a means for impregnating or injecting the polymeric resin liquid, the polymeric resin liquid is press-injected from the surface of the wood using a method such as a bessel method, a leuping method, a lorry method, etc. It was common to do so.

0004

[Problems to be Solved by the Invention] However, in the method of impregnating or injecting resin liquid based on the above-mentioned prior art, it is difficult to adjust the amount of impregnation, and the entire wood is subject to impregnation.
Since it was not possible to partially impregnate the wood with resin, the weight of the resin-reinforced wood increased more than necessary, and its use had to be limited to high-end products.Furthermore, it was not possible to impregnate or inject polymeric resin liquid. In addition, since the process is carried out from the surface of the wood, the surface tends to be treated with resin in any case, and the appearance and feel (hereinafter referred to as texture) typical of wood tend to be lost.

[0005] The present invention solves the above-mentioned problems of the prior art and makes it possible to treat the required amount of resin according to factors such as the type, size, and purpose of the target wood, thereby suppressing weight increase. Furthermore, the primary objective was to create a product that could be used in general-purpose products without sacrificing the texture, and the surface of the thus obtained reinforced wood was coated with or impregnated with a preservative. The second objective is to provide reinforced wood that also has weather resistance.

[0006]

[Means for Solving the Problems] The invention as set forth in claim 1 is directed to forming a cylindrical hollow part along the fiber direction of wood, injecting a polymeric resin liquid into this hollow part, and then turning the wood into a hollow part. Rotate around the axis of the hollow part to impregnate the inner wall surface of the hollow part with resin,
The gist of the invention is a method for producing resin-reinforced wood, which is characterized in that the resin is then polymerized and solidified. Its gist is resin-reinforced wood whose surface is impregnated or coated with a preservative.

In the invention described in claim 1, the fiber direction of the wood refers to the axial direction of the wood. Further, the shape of the cylindrical hollow part provided along the fiber direction of the wood is not particularly limited. For example, as shown in FIGS. 1 and 2, the wood 1 is log-shaped, The hole may be formed as a through hole 2 coaxially with the axis 3 in the direction (direction), or may be formed as a blind hole 10 with a bottom as shown in FIGS. 3 and 4. Further, it is preferable that the internal volume of the hollow portion is set at a volume ratio of 10 to 50% with respect to the volume of the entire wood.

[0008] The most common method for creating this hollow part is to use a wood lathe to make a hole in the target wood, but there are also methods using a hand drill or other woodworking machine, or by hand. It can also be work. Further, a centrifuge is usually used as a means for injecting the polymerizable resin liquid into the hollow portion and then rotating it in the circumferential direction.

Typical preservatives used in the invention according to claim 2 include creosote oil, PF preservatives, CCA preservatives, etc. Preservatives may also be applied to the surface of the resin-reinforced wood. Examples of impregnating or coating methods include pressure injection, dipping, brushing, and spraying.

0010

[Operation] The present invention as set forth in claim 1 provides for forming a cylindrical hollow part along the fiber direction of the wood, injecting a polymeric resin liquid into the hollow part, and then inserting the wood into the axial center of the hollow part. Since the inner wall surface of the hollow part is impregnated with resin by rotating the hollow part, and the resin is then polymerized and solidified, the amount of impregnated polymeric resin liquid is determined by the volume of the polymeric resin liquid injected into the hollow part in the entire wood. This can be done arbitrarily by setting various rates. Furthermore, since centrifugal force is applied to the polymerizable resin liquid by rotating the wood, and the polymerizable resin liquid is impregnated from the inner wall surface of the hollow portion, the appearance of the resin-reinforced wood will not be damaged even if it is polymerized and solidified.

[0011] The present invention according to claim 2 is obtained by impregnating or coating the surface of the resin-reinforced wood obtained by the manufacturing method according to claim 1 with a preservative, so that the resin-reinforced wood has weather resistance. Granted.

0012

[Embodiment] An embodiment of the present invention will be described below. FIG. 1 is a schematic explanatory diagram showing an embodiment of the method of the present invention according to claim 1, FIG. 2 is a cross-sectional view of resin-reinforced wood obtained by the same manufacturing method, and FIG. FIG. 4 is a schematic explanatory diagram showing another embodiment of the method of the present invention described in FIG.
is a cross-sectional view of resin-reinforced wood obtained by the above manufacturing method.

Example 1 As shown in FIGS. 1 and 2, the dimensions are 1 m in length x 1 m in outer diameter.
A through hole 2 with an inner diameter of 6 cm is drilled in the longitudinal axis of a 2 cm cedar log, with the axis 3 aligned, and a removable closing plate 4 is attached to the bottom to make it bottomed, and one end is closed. A cylindrical hollow part 5 was formed. Next, this is placed in an upright state with the closing plate 4 at the bottom, and 0.5% by weight of methyl methacrylate monomer as a polymerizable resin and azobisisobutyronitrile as a polymerization initiator are put into the hollow part 5. The mixed liquid 6 obtained by mixing was injected so that the height was D1, and it was rotated for 1 hour using a centrifuge (not shown) (rotation speed = 500 rpm), and when the closing plate 4 was removed, resin impregnation was observed. It was possible to obtain a resin-reinforced wood 8 as shown in FIG. The weight of this product was measured at a temperature of 26℃ and a humidity of 60%, and the weight increase rate was 53%.
Met. Moreover, the surface of the resin-reinforced wood 8 retained its original texture.

Comparative Example 1 A resin-reinforced wood was obtained in the same manner as in Example 1, except that the polymeric resin liquid was impregnated using the conventional atmospheric pressure dipping method in which the wood was injected from the surface. The weight of this is at a temperature of 26℃.
When measured under conditions of 60% humidity, the weight increase rate was 1
It was 0.5%. Also, its surface is unusually smooth and hard,
The original texture was lost.

Example 2 The resin-reinforced wood 8 obtained in Example 1 was immersed in creosote oil (manufactured by Niwada Shoten Co., Ltd.), a commercially available preservative, for 1 hour and dried. The resin-reinforced wood described above was obtained. After weather-proofing it, its antiseptic properties were tested, and the efficacy value against Quercus japonica was 87. The efficacy value was determined by efficacy value = [(no treatment - treatment) x test weight loss rate / untreated test weight loss rate] x 100.

Example 3 As shown in FIGS. 3 and 4, the dimensions are 1 m in length x 1 in outer diameter.
A blind hole 10 with an inner diameter of 6 cm and one end closed by aligning the shaft core 9 with the shaft core 9 in the longitudinal direction of a 2 cm cedar log was bored to form a container-shaped hollow part 11. Next, the closed part is placed in an upright position, and 0.5% by weight of methyl methacrylate as a polymerizable resin and azobisisobutyronitrile as a polymerization initiator are put into the hollow part 11 and mixed. When the obtained mixed liquid 12 was injected to a height of D2 and rotated for 1 hour using a centrifugal separator (not shown) (rotation speed = 500 rpm), the area occupied by the resin-impregnated portion 13 is shown in FIG. 4. A resin-reinforced wood 14 like this could be obtained. The weight of this product was measured at a temperature of 26° C. and a humidity of 60%, and the weight increase rate was 62%. Furthermore, the surface of the resin-reinforced wood 14 retained its original texture.

Comparative Example 2 A resin-reinforced wood was obtained in the same manner as in Example 3, except that the polymerizable resin liquid was impregnated using the conventional atmospheric pressure dipping method in which the wood was injected from the surface. The weight of this is at a temperature of 26℃.
When measured under conditions of 60% humidity, the weight increase rate was 1
05%, the surface was abnormally smooth and hard, and had lost its original texture.

The weight increase rate was determined by weight increase rate = [(weight of polymerized material - weight of untreated material) ÷ weight of untreated material] x 100.

[0019]

Effects of the Invention The present invention as set forth in claim 1 forms a cylindrical hollow part along the fiber direction of wood, injects a polymeric resin liquid into this hollow part, and then moves the wood along the axis of the hollow part. The inner wall surface of the hollow part is impregnated with resin by rotating it around the core, and then the resin is polymerized and solidified, so the amount of impregnation of the polymeric resin liquid injected into the hollow part is determined by the amount of the polymeric resin liquid injected into the hollow part. This can be done arbitrarily by setting various occupying volume ratios. Furthermore, since centrifugal force is applied to the polymerizable resin liquid by rotating the wood, and the polymerizable resin liquid is impregnated from the inner wall surface of the hollow portion, the appearance of the resin-reinforced wood will not be damaged even if it is polymerized and solidified.

[0020] Therefore, in combination with the weight reduction due to the provision of the hollow portion, it is possible to suppress an unnecessary increase in weight, and it is also possible to obtain a product that can be used in general-purpose products without sacrificing texture. It is. The present invention according to claim 2 is a resin-reinforced wood characterized in that the surface layer of the resin-reinforced wood obtained by the manufacturing method according to claim 1 is impregnated or coated with a preservative. Adds weather resistance to reinforced wood, expanding its range of uses.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram showing an example of the method for producing resin-reinforced wood of the present invention according to claim 1.

FIG. 2 is a sectional view showing an example of resin-reinforced wood obtained by the above manufacturing method.

FIG. 3 is a schematic explanatory diagram showing another example of the method for producing resin-reinforced wood of the present invention according to claim 1.

FIG. 4 is a sectional view showing an example of resin-reinforced wood obtained by the above manufacturing method.

[Explanation of symbols]

1 Wood 2 Through hole 3 Axis core ４　　　Occluded plate 5 Hollow part 6 Mixed liquid 7 Resin-impregnated part 8 Resin reinforced wood 9 Axis core 10 Blind hole 11 Hollow part 12 Mixed liquid 13 Resin-impregnated part 14 Resin reinforced wood

Claims (2)

[Claims] Claim 1: A cylindrical hollow part is formed along the fiber direction of the wood, a polymeric resin liquid is injected into the hollow part, and the wood is then rotated around the axis of the hollow part to form a hollow part inside the hollow part. A method for producing resin-reinforced wood, which comprises impregnating a wall surface with resin and then polymerizing and solidifying the resin. 2. A resin-reinforced wood obtained by the method according to claim 1, wherein the surface of the resin-reinforced wood is impregnated or coated with a preservative.