KR20160073244A - Method for treatment preservative of timber - Google Patents

Abstract

The present invention relates to a method for treating a preservative of timbers. More specifically, the infiltration ratio of the preservative (preservative absorption rate) is significantly increased by radiating an electron beam after pressurizing the preservative in between the same when radiating a first and a second electron beam into the timbers after a pre-treating step, and efficiency and marketability of the timbers are significantly improved by not generating exterior damages of the timbers through stab treatment for increasing the conventional infiltration ratio.

Description

[0001] The present invention relates to a method for preserving timber,

More particularly, the present invention relates to a wood preservative treatment method, and more particularly, to a wood preservative treatment method which irradiates a primary electron beam to a wood after a pretreatment step, presses a preservative therebetween, (Absorptivity of preservative) is remarkably increased, and the appearance of the wood is not impaired due to the stabbing treatment or the like for increasing the penetration rate in the past, so that the efficiency and the commerciality of the wood are greatly improved.

Though wood is a porous material, it is an unstable material that is difficult to penetrate liquids in some species or materials. The treatment effect depends on the chemical permeability of the wood in various chemical modification treatments which are carried out to complement or eliminate the disadvantages of the wood including the preservative treatment.

There are various factors affecting the liquid penetration of wood, but the blockage of potholes is the main factor controlling permeability. The occlusion of the coniferous pore wall is a phenomenon in which the pore wall (torus + maroon) adheres to the wall tool, which is the penetration passage of the liquid, due to the surface tension of the water as the drying progresses.

In particular, clogging of potholes caused by the progress of deepening is a physiological phenomenon of a tree which makes it difficult to perform wood preservative treatment which is not easily opened even by external pressure. In order to improve the permeability of the preservative, a greasing treatment is generally used to form a sheath on the surface of the raw material.

However, it is disadvantageous that the appearance is damaged by the traces of stains remaining on the surface of the product.

In addition, water-soluble wood preservatives are economical and easy to handle, making them the most widely used wood preservative in the world.

However, there are limitations that require a certain period of curing period after treatment. If it is applied directly to the site without curing process after preservative treatment, there is a risk that the preservative active ingredient is leached from the treated wood by moisture during rainfall.

As a result, the antiseptic effect can not be attained due to loss or reduction of the preservative effect, and the soil and water quality can be contaminated by the leached antiseptic component, thereby causing secondary damage.

Among curing methods of wood treated with water-soluble preservatives, natural curing requires a period of not less than 3 weeks, since it is the most economical because the additional cost is not required and the processed wood must be dried in a natural state.

Therefore, there are many cases where the products are shipped out on the delivery date of preservative-treated wood products and carried out without a sufficient curing process.

In order to solve such a problem, as disclosed in Korean Patent Publication No. 10-0986174, a promoting curing method capable of shortening a curing period and obtaining an excellent effect is a curing method in which the curing treatment is carried out at a temperature of 60 ° C or lower for 3 days or more, For 30 minutes or more.

However, these accelerated curing methods are also not applied in the field, because facilities capable of generating and supplying high temperature steam to drying tanks or preservation tanks which can be heated by steam in an enclosed space are required.

Also, when the wood preservative is not permeable to the wood, the effect of the preservative is deteriorated when the wood is used for a long time, causing various problems in the wood.

Korean Patent Registration No. 10-0986174

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems,

After the pretreatment step, the primary and secondary electron beams are irradiated to the wood, and the preservative is pressed therebetween and then irradiated with the electron beam, the penetration rate of the preservative (the preservative absorption rate) is significantly increased in the wood, The present invention provides a wood preservative treatment method which can improve the efficiency and commerciality of wood without damaging the appearance of the wood.

In order to accomplish the above object, the present invention provides a method of manufacturing a wood structure, comprising: a pretreatment step (S100) of compressing wet wood to remove water and at the same time deforming wood tissue;

A step (S200) of irradiating a primary electron beam onto the wood after the preprocessing step (S100);

After the electron beam irradiation (S200), a step of pressurizing and preserving the preservative on the wood (S300);

And a step (S400) of irradiating a secondary electron beam to the wood after curing (S300) to cure the wood (S400).

As described above, in the method of preserving wood of the present invention, after the pretreatment step, the primary and secondary electron beams are irradiated to the wood, the preservative is pressed therebetween, and then the electron beam is irradiated, (Absorptivity of preservative) is remarkably increased, and the appearance of the wood is not damaged by the splash processing or the like for increasing the penetration rate in the past, and the efficiency and the commerciality of the wood are greatly improved.

FIG. 1 is a flowchart illustrating a method of preserving wood according to an embodiment of the present invention,
FIG. 2 is a graph showing penetration rates of a preservative according to the compression amount of wood according to an embodiment of the present invention,
FIG. 3 is a graph showing the penetration degree of a preservative according to a pressurized state according to an embodiment of the present invention,
FIG. 4 is a graph showing absorption amounts of a preservative according to a pressurized state according to an embodiment of the present invention,
FIG. 5 is a graph showing ACQ remaining ratio for each ACQ-treated pine curing method according to an embodiment of the present invention,
FIG. 6 is a graph showing the CuO remaining ratio according to the curing method of the CUAZ treated pine according to an embodiment of the present invention.

The present invention having such characteristics can be more clearly described by the preferred embodiments thereof.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Before describing in detail several embodiments of the present invention with reference to the accompanying drawings, it is to be understood that the present invention is not limited to the details of construction and the arrangement of components shown in the following detailed description or illustrated in the drawings will be. The invention may be embodied and carried out in other embodiments and carried out in various ways. It should also be noted that the device or element orientation (e.g., "front," "back," "up," "down," "top," "bottom, Expressions and predicates used herein for terms such as "left," " right, "" lateral," and the like are used merely to simplify the description of the present invention, Or that the element has to have a particular orientation. Also, terms such as " first "and" second "are used herein for the purpose of the description and the appended claims, and are not intended to indicate or imply their relative importance or purpose.

Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

FIG. 1 is a flow chart showing a method of preserving wood according to an embodiment of the present invention. FIG. 2 is a graph showing penetration rates of preservatives according to the compression amount of wood according to an embodiment of the present invention. FIG. 4 is a graph showing the absorption amount of the preservative according to a pressurized state according to an embodiment of the present invention, FIG. 5 is a graph showing the absorption amount of the preservative according to an embodiment of the present invention FIG. 6 is a graph showing the CuO remaining ratio according to the curing method of the CUAZ treated pine according to an embodiment of the present invention. FIG. 6 is a graph showing the ACQ remaining ratio according to the curing method of the ACQ treated pine tree according to the present invention.

As shown in FIGS. 1 to 6, the method of preserving wood according to the present invention comprises a pretreatment step in which wet wood is conveyed and compressed while passing between a pair of spaced apart compression rollers, (Dried), and at the same time, the internal structure of the wood is deformed (S100).

As described above, since the structure of the wood is deformed, the penetration rate of the preservative increases when the preservative is subsequently treated.

In addition, when the wood is compressed between the compression rollers, the thickness of the compression is changed by compressing the wood more than once, and the penetration rate (invasion degree,%) of the preservative is changed as shown in FIG. The average degree of penetration of the preservative is high.

Then, the electron beam is first irradiated to the wood (S200), and then the wood is irradiated with the electron beam secondarily even after preservative-preserving treatment is performed on the wood.

Here, the characteristics of the electron beam are as follows. The electron beam is irradiated by an electron beam accelerator (10 MeV). The electron beam is a bundle of electrons emitted from the electron beam accelerator, which accelerates electrons close to the speed of light by applying a high voltage in a high vacuum state do.

In addition, the electron beam has high kinetic energy and high material permeability, and is subjected to bond degradation, cross-linking, polymerization, and radical formation.

The application fields of the electron beam are used for purification of water (waste water) and air (VOC), sterilization / insecticide treatment (meat, processed foods, cereals, fruits, etc.), polymer modification, fiber modification, waste recycling and resin coating.

Next, the preservative is pressed on the wood to be preserved (S300). The preservative is composed of copper-alkylammonium compound (ACQ-2) wood preservative or copper-azole compound (CUAZ-3) wood preservative Are mixed in water.

The water is diluted 12 times to 10 to 20% of the copper-alkylammonium compound (ACQ-2) wood preservative and 8 to 15% of the copper-azole compound (CUAZ-3) Dilute to 35 times the concentration.

The wood is enclosed in a pressurizing tank or a pressurizing cylinder to seal the inside of the pressurizing cylinder or the pressurizing cylinder, and presses the set pressure. The preservative is introduced into the pressurizing tank or the pressurizing cylinder and pressurized to absorb the preservative in the wood. At this time, the pressurization takes about 4 hours.

In the present invention, as shown in FIG. 3 and FIG. 4, experiments in which the preservative is pressurized at a pressure of 15 to 18 kg / cm 3 and at a pressure of 22 to 25 kg / cm 3 and then an electron beam is irradiated are shown in the graph. (80% or more of the area from the surface to 10 mm from the material surface) satisfying all the standards of the untreated and electron beam treated test specimens subjected to the pressure treatment under the condition of 18 kg / cm3 was not obtained. At this time, the average number of untreated specimens was only 30.3%, while that of electron beam specimens was only 46.2%, which was only 70.5%.

In the case of the electron beam treatment specimen, the preservative penetration was promoted compared with the non-treatment, but the penetration depth of the preservative was not uniform because the penetration depth from the surface was not uniform.

On the other hand, in the specimens subjected to the high pressure (22 ~ 25kg / ㎤), penetration of the preservative was accelerated. Especially, the tendency was apparent in the specimen treated with electron beam. In the case of non - treated specimens, preservative penetration was promoted, but the penetration rate was only 51.9% on average. However, in the specimen treated with electron beam, except for the electron beam dose of 250 kGy, all of the specimens satisfying the invasiveness criterion were met.

As shown in FIG. 4, the amount of water absorption was not more than 2.6 kg / h, which is the H3 class compliance standard of the ACQ-2 operating environment category, in all of the untreated and electron beam treated specimens at the standard pressure (15 to 18 kg / The results showed that the characteristics of the larch seedlings were confirmed.

In addition, as the pressure was increased to 22 ~ 25kg / ㎤ for accelerating penetration of preservative, the amount of absorption tended to increase as compared with the standard pressure. However, the untreated specimens still did not meet the acceptable standards, and the electron beam treatment specimens showed an average absorption of 2.6 kg / ㎡ or less except for the electron beam dose of 150 kGy and 300 kGy. In order to solve this problem, it is necessary to increase the concentration of the treatment solution slightly, although the degree of penetration satisfies the criterion when the pressing force is increased by the electron beam treatment.

Finally, after the preservative is applied to the wood, the wood is dried and cured by irradiating the electron beam secondarily (S400).

As shown in FIG. 5 and FIG. 6, depending on the curing of the electron beam, the residual ratio of the drug (ACQ or CuO) in the ACQ or CUAZ treatment is different from the total amount of Cu leaching, , The effect of accelerating the curing of the electron beam is recognized.

Claims (6)

A pretreatment step (S100) of compressing the wet wood to remove water and at the same time deforming the wood tissue;
A step (S200) of irradiating a primary electron beam onto the wood after the preprocessing step (S100);
After the electron beam irradiation (S200), a step of pressurizing and preserving the preservative on the wood (S300);
After the preservation treatment (S300), a step of irradiating a secondary electron beam to the wood to cure (S400);
The method according to claim 1,
The method according to claim 1,
In the pretreatment step (S100) of compressing the wet wood to remove water and at the same time deforming the wood tissue,
Wherein said wet wood is compressed while passing between a pair of spaced apart compression rollers.
The method according to claim 1,
Wherein the electron beam irradiation is performed through an electron beam accelerator.
The method according to claim 1,
In the step S300 of pressing the preservative on the wood to be preserved,
Wherein the preservative is prepared by diluting a copper-alkylammonium compound-based wood preservative or a copper-azole compound-based wood preservative to 12 to 35 times with water.
5. The method of claim 4,
Characterized in that a copper-alkylammonium compound-based wood preservative at a concentration of 10 to 20% (w / v) or a copper-azole compound-based wood preservative at a concentration of 8 to 15% (w / v) / RTI >
The method according to claim 1,
Wherein the pressure of the preservative is 22 to 25 kg / cm < 3 >.

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