JPH04296506A - Manufacture of resin reinforced lumber - Google Patents

Abstract

PURPOSE:To provide a manufacture capable of expanding the range of uses by using jointly an antiseptic agent other than resin as an impregnant although conventionally resin reinforced lumber is made by a method wherein polymeric resin is injected into lumber through means of an atmospheric pressure steeping method or the like and then polymerically cured in the inner part of lumber, and since the antiseptic agent has nothing therein at all, it is employed, as use, as an interior material of building materials. CONSTITUTION:Polymeric resin liquid consisting of blending an emulsifying agent, polymerizing initiator, and pyroligneous acid into polymeric monomer or oligomer is impregnated into lumber, and ones obtained is polymerized by imperting heat &, light &, or other active energies, and thereby resin reinforced lumber is given mechanical strength as well as weatherability, thus enabling the using range of the lumber obtained to be extended to an exterior material of building materials.

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.

0002

[Prior Art] Resin-reinforced wood is obtained by impregnating or injecting resins such as vinyl monomers and prepolymers such as methacrylic acid esters and styrene, and unsaturated polyester into wood, and polymerizing and solidifying them within the wood. This is well known. In addition, in this known technology, conventionally it could not be applied to wood with high moisture content and the resin used was limited to hydrophilic resins, but by emulsifying the impregnating agent, hydrophobic resins can be used. Japanese Patent Publication No. 63-203 describes a technique that can be applied to wood with a high moisture content. This type of resin-reinforced wood has the texture, dimensional stability, and mechanical strength of natural wood, and is used as general interior material, furniture,
It has come to be widely used for fittings, etc.

0003

[Problems to be Solved by the Invention] However, the above-mentioned conventional technology maintains the inherent characteristics of natural wood while adding new characteristics such as dimensional stability, and its range of applications is gradually expanding. , weather resistance, and corrosion resistance have not yet been developed, and the expansion of their applications is currently being restricted, and the above-mentioned publication does not mention anything about antiseptic treatment.

The main reason for this is that the preservatives currently used for wood preservative treatment are CCA (main components are hexavalent chromium,
Copper compounds, arsenic compounds), and pollution such as air pollution caused by harmful gases generated during incineration and soil contamination caused by ash is currently a major problem. Considering this, it seems that it is far from safe for the human body.

[0005] As a result of intensive research in view of the state of the prior art as described above, the present inventor focused on wood vinegar, which is a preservative that is water-soluble and relatively safe for the human body, and developed a method using this. Specifically, the present invention has been completed based on the knowledge that the above-mentioned problems can be solved.

[0006]

[Means for Solving the Problems] The present invention provides a method for immersing a polymerizable resin solution prepared by mixing a polymerizable monomer or oligomer and pyroligneous vinegar in any of the following conditions: normal pressure, reduced pressure, pressurized pressure, and reduced pressure-pressure. The gist of the invention is a method for producing resin-reinforced wood, which is characterized by impregnating wood by a method and polymerizing the obtained product by applying active energy.

[0007] The polymerizable resin liquid in the present invention refers to an emulsion obtained by mixing a polymerizable monomer or oligomer, an emulsifier, a polymerization initiator, and wood vinegar solution. However, as polymerizable monomers or oligomers, methacrylic acid ester, styrene, 2-hydroxy-
Examples include oligoesters of acrylic acid and methacrylic acid such as 3-phenoxypropyl acrylate (or methacrylate), α,ω-diaryl (or dimethacrylic) bisdiethylene glycol phthalate (or tetrahydrophthalate), etc. Use one or more types.

Examples of emulsifiers include nonionic surfactants such as polyoxyethylene octylphenol ether and polyoxyethylene sorbitan monolaurate. Examples of the polymerization initiator include benzoyl peroxide and azobisisobutyronitrile.

The wood vinegar solution used in the present invention is a by-product produced during the production of charcoal, etc., and is obtained by cooling the smoke emitted during the thermal decomposition of such wood, allowing it to stand, and removing some of the tar content. It is something. A water-soluble component with a pH of 2
The main component is usually acetic acid in the range of about 4 to 3.
8%, methanol about 1%, dissolved wood tar about 2~
The components of this wood tar include phenol, guaiacol, ethylguaiacol, dimethyl ether, and others. Unlike ordinary preservatives, this wood vinegar solution is a natural product, so it is extremely safe among commercially available preservatives.

In the present invention, in order to obtain a polymerizable resin liquid, pyroligneous acid solution, an emulsifier, and, if necessary, a polymerization initiator are added to the polymerizable monomer or oligomer, and the mixture is mixed and stirred to form an emulsion. However, it is also possible to prepare an emulsion of other ingredients except pyroligneous vinegar and then add pyroligneous vinegar to this prepared liquid. The blending ratio is usually 30 parts by weight of polymerizable monomer or oligomer, 7 parts by weight of wood vinegar
0 parts by weight and 10 parts by weight of emulsifier, however, it is possible to adopt an appropriate formulation depending on each application.

In the present invention, the means for impregnating the wood with the polymerizable resin liquid made into the emulsion is carried out by any of the following immersion methods: normal pressure, reduced pressure, pressurization, and reduced pressure-pressure. Generally, normal pressure immersion is carried out by instantaneous immersion or short-time immersion, reduced pressure immersion is carried out by the double bakim method, and reduced pressure-pressure immersion is carried out by the bezel method or lorry method. In this way, in order to polymerize the polymerizable resin liquid after impregnating the wood with the polymerizable resin liquid, active energy is given to the obtained material, and the active energy includes thermal energy, light energy, etc. Examples include energy, radiation energy, etc., and the simplest method is to send wood impregnated with resin liquid into a heating furnace and heat and polymerize the resin.

0012

[Function] The present invention impregnates wood with a polymerizable resin solution made by mixing a polymerizable monomer or oligomer with pyroligneous vinegar using any of the following immersion methods: normal pressure, reduced pressure, pressurized pressure, and reduced pressure-pressure. Since the method is characterized in that activation energy is applied to the obtained product for polymerization, the polymerization of the resin and the drying of the wood vinegar solution can be carried out simultaneously in the same process. Furthermore, the pyroligneous acid is fixed in the wood due to the polymerization effect of the resin. In addition, thinned wood and small-diameter trees, which had little utility value in the past, are impregnated with a preservative (wood vinegar), making them suitable for outdoor use, and impregnated with resin to improve strength and size. It provides stability and makes the material durable for use in normal fields of application.

[0013]

[Embodiment] An embodiment of the present invention will be described below. To cedar wood, add 70 parts by weight of wood vinegar, 30 parts by weight of methyl methacrylate oligomer, 10 parts by weight of polyoxyethylene octylphenol ether as an emulsifier, and 2 parts by weight of azobisisobutyronitrile as a polymerization initiator,
Emulsion mixed using a homogenizer,
Impregnation was carried out under vacuum at 700 cmHg for 0.5 hours and under normal pressure for 0.5 hours using a reduced pressure-atmospheric pressure immersion method, followed by heat treatment at a temperature of 60 to 80° C. for 24 hours.

The resulting resin-reinforced wood has a resin content of 39% and a
When treated for 0 days, the anti-hygroscopic ability was 26% and the anti-swelling ability was 57.
%Met. In addition, the weight reduction rate in a three-month long-term durability test under a temperature condition of 26° C. was 1.0% (Ostrifolia spp.) and 0.3% (Versaceae). In addition, the measurement of resin content is as follows: PL (%) = [(polymerized material weight - untreated material weight)
/ weight of untreated material] x 100, and the measurement of anti-hygroscopic ability was performed using MEE (
%) = [(moisture absorption rate of untreated material - moisture absorption rate of treated material) / moisture absorption rate of untreated material] x 100, anti-swelling ability was measured using ASE (%
)=[(swelling rate of untreated material−swelling rate of treated material)/swelling rate of untreated material]×100, and the long-term durability test was conducted according to JIS-A-9302.

[0015]

[Effects] The present invention provides a polymerizable resin solution prepared by mixing a polymerizable monomer or oligomer with wood vinegar solution.
It is characterized by impregnating the wood using any of the following methods: normal pressure, reduced pressure, pressurization, and reduced pressure-pressure, and polymerizes the obtained material by imparting active energy. Drying can be performed simultaneously in the same process. Furthermore, the pyroligneous acid is fixed in the wood due to the polymerization effect of the resin. In addition, thinned wood and small-diameter trees, which had little utility value in the past, are impregnated with a preservative (wood vinegar), making them suitable for outdoor use, and impregnated with resin to improve strength and size. It provides stability and makes the material durable for use in normal fields of application.

[0016] Therefore, the present invention has many effects listed below. (1) Since it is impregnated with pyroligneous vinegar as a preservative, it can be used outdoors, and it can also be used in the architectural field for exterior wall materials, deck materials, taruki, nose combs, and other exterior materials. (2) Because pyroligneous vinegar is water-soluble, it usually tends to be leached by rainwater, etc. However, in the case of the present invention, since it is impregnated at the same time as the reinforcing resin, the polymerization of the reinforcing resin and the drying of the pyroligneous vinegar are the same. It can be implemented in the process, simplifying the manufacturing process, and
The reinforcing resin also makes it possible to stabilize the adhesion of the pyroligneous vinegar solution, providing a durable preservative cure. (3) Wood vinegar, which is originally a by-product of charcoal production, can be used effectively. (4) Effective use of forest resources can be achieved.

Claims (1)

[Claims] [Claim 1] A polymerizable resin liquid obtained by mixing a polymerizable monomer or oligomer with pyroligneous vinegar is heated at normal pressure, reduced pressure,
1. A method for producing resin-reinforced wood, which comprises impregnating wood with a dipping method using either pressurization or reduced pressure-pressurization, and polymerizing the resulting material by applying active energy.