KR102356169B1 - Manufacturing method of deck board - Google Patents

Abstract

The present invention relates to a wooden deck board, which is treated with an impregnating liquid in which zinc and copper-supported zeolite are dispersed, and by forming an irregular uneven surface on one surface, prevents mold and decay of the wooden deck, resulting in product quality and lifespan can be improved and applied to various frames for construction.

Description

Method of manufacturing deck board. {MANUFACTURING METHOD OF DECK BOARD}

The present invention relates to a method for manufacturing a deck board, and more particularly, in the process of manufacturing a deck board using wood flour, wood fiber or solid wood, etc., by performing an impregnation process using an antifungal composition. It relates to a method for manufacturing a deck board with improved preservation.

The deck board is used for interior materials, exterior materials, flooring materials of buildings, and is manufactured by processing natural wood or processing synthetic wood.

Natural wood requires long-term wet drying and antiseptic treatment due to problems such as warping, cracking, mold, and decay during commercial use. processing is required.

Through Korean Patent Publication No. 10-1149280, the applicant is processing the irregular uneven surface on the surface of the deck board made of wood fiber as a raw material to suppress the occurrence of strength, warpage, cracks, etc., and improve the slip resistance.

However, even in such a deck board, it is necessary to optimize the process of manufacturing a deck board because the problem of mold or rot occurs during long-term use.

As a method of imparting antibacterial and antifungal performance to wood, a method of impregnating wood with an impregnation solution containing ocher is known in Korean Patent No. 10-1823826, and in the case of deck board, wood, which is a raw material, is heated at high temperature and high pressure. Since the process of molding by compression is required, there is a problem in that the antibacterial and antifungal performance is deteriorated after the molding process even if the wood is treated with such an impregnation solution.

In addition, in Korean Patent No. 10-1333743, a zeolite-based fungicide in which silver and zinc are supported in an amount of 5% by weight based on the total weight is applied. In the case of wood powder, since the mold inhibitor is mixed with the binder resin and molded, it can be applied only to deck boards using synthetic wood, and there is a problem in that it is difficult to apply in the case of solid wood.

Republic of Korea Patent Publication No. 10-1149280 Republic of Korea Patent Publication No. 10-1823826 Republic of Korea Patent Publication No. 10-1333743 Korean Patent Publication No. 10-2019-0038380

The present invention has been devised to solve the problems of the prior art as described above, and by optimizing the impregnation process during the manufacturing process of the wooden deck, it prevents mold generation and decay of the manufactured wooden deck, thereby improving the quality and lifespan of the product. for that purpose

The wooden deck board of the present invention for solving the above problems is treated with an impregnation solution in which zinc and copper-supported zeolite are dispersed, characterized in that an irregular uneven surface is formed on one surface.

In addition, the deck board is prepared by cutting, pulverizing or pelletizing a wood raw material, put in an impregnation solution in which zinc and copper-supported zeolite are dispersed, impregnated and aged, and then pressurizing, cutting and It can be manufactured by surface processing.

In addition, the im-processed wood constituting the deck board may be carbonized im-processed wood.

The method for manufacturing a wooden deck according to the present invention shows the effect of improving the quality and lifespan of the product by preventing mold and decay of the manufactured wooden deck by optimizing the impregnation process during the manufacturing process of the wooden deck.

Hereinafter, the present invention will be described in detail.

The wooden deck board according to the present invention is treated with an impregnating solution in which zinc and copper-supported zeolite are dispersed, and is characterized in that an irregular uneven surface is formed on one surface. The irregular uneven surface formed on one surface of the wooden deck board can be formed by surface processing using a molder during the process of manufacturing the deck board. After constructing the wooden deck board, the user will provide a structure that can suppress the sliding phenomenon on the surface of the deck board.

The wooden deck board is prepared by cutting, pulverizing, or pelletizing a wood raw material to produce unprocessed wood, inserting the unprocessed wood into an impregnation solution in which zinc and copper-supported zeolite are dispersed and impregnated to produce impregnated wood; It is characterized in that it comprises a step of manufacturing a deck board by pressing and cutting processing after aging the impregnated wood, and a surface processing step of surface processing the deck board to form an irregular concave-convex surface on one surface. In addition, the deck board on which the irregular uneven surface is formed through the surface processing is completed in the final deck board shape through the molding process. In addition, it is possible to perform a process of applying natural oil to the surface for protection of the manufactured deck board product.

In other words, by cutting the felled wood to manufacture the processed wood, it is to manufacture a wooden deck board through this. In the case of wooden deck boards, although they undergo surface treatment after manufacturing, it is inevitable that the material deteriorates over time. has a direct impact on the quality of In the case of synthetic wood mixed with wood flour and plastic, there is little mold problem, but the degree of water expansion and discoloration is large and the service life is short due to the relatively small bending strength. .

In order to solve the mold and difficult problems of these wooden deck boards, the unprocessed wood may be carbonized, and in the case of carbonization, torrefaction of carbonizing the surface of the wood is possible by heat treatment at a temperature of 200 to 250 ° C., Through this, it is possible to suppress the occurrence of insect repellent, antiseptic and mold.

However, there is a problem that carbonization treatment cannot be applied to all wood raw materials because the carbonization treatment alone cannot sufficiently suppress the occurrence of mold and there are cases where the color due to the carbonization treatment is lowered depending on the material of the wood.

In order to solve this problem, inorganic materials such as titanium oxide, copper oxide, and zinc oxide that exhibit antifungal performance may be applied. For example, Korean Patent Laid-Open Publication No. 10-2019-0038380 discloses a technique for applying an antifungal agent mixed with titanium oxide fine particles and alloy fine particles containing an antifungal metal to the surface of various members. However, in the case of wooden decks, metal components should not be detected, and in the case of commercially available wooden decks, metals such as lead, cadmium, chromium, copper, astatine, mercury, zinc, nickel, etc. should not be detected in a hazardous substance detection test. There is a problem in applying it as an antifungal agent.

Therefore, in the present invention, by performing a process of impregnating the processed wood with an antifungal agent in the manufacturing process of the wooden deck, a wooden deck board treated with an impregnation solution in which zinc and copper-supported zeolite are dispersed is provided.

As the impregnating liquid having the antifungal performance, an aqueous dispersion in which zinc and copper-supported zeolite are dispersed is used. In particular, as the zinc and copper, zinc oxide and copper oxide are used in combination, and when the zinc oxide (ZnO) and copper (II) oxide (CuO) are supported in an appropriate ratio, the antifungal performance is experimentally shown to be excellent. The anti-fungal performance of zinc oxide or copper (II) oxide has been reported in some literatures, but in the present invention, the anti-fungal performance of the deck board is improved by mixing the zinc oxide and copper (II) oxide.

In particular, it was confirmed that the optimal effect was exhibited when the molar ratio of zinc and copper supported on the zeolite was 1:1 to 1:1.5. When either zinc oxide or copper oxide was used alone as the supported metal oxide, it was found that sufficient anti-fungal performance was not expressed, and even when the molar ratio of zinc and copper was exceeded, the anti-fungal performance was decreased .

In addition, the zinc and copper are preferably supported in an amount of 0.1 to 5 wt% based on zinc oxide (ZnO) and copper oxide (CuO) based on 100 wt% of the zeolite. The method of supporting the zeolite is to prepare an aqueous solution by dissolving soluble starting materials such as hydrates of _{zinc nitrate (Zn(NO 3} ) ₂ ) and copper nitrate (Cu(NO ₃ ) _{2 ) in water, and then it is prepared by wet loading method.} can do. It is preferable to use a natural zeolite as the zeolite. Since zeolite has a large surface area and a porous structure, it is suitable as a carrier for adsorbing zinc oxide or copper oxide, and zeolite has its own moisture adsorption performance, so it is considered a suitable material to express antifungal performance.

In order to confirm the effect of the treatment of the impregnation solution, the deck board was manufactured by the following process.

By using a cutter, the bamboo was divided into 8 to 18 equal parts to prepare a 10 to 15 mm long bamboo unprocessed wood. The bundle was made by roll compression using the bamboo as a bundle, and then impregnated with an impregnation solution for 1 to 5 minutes to perform the impregnation treatment.

In addition, an aqueous solution of zinc nitrate and copper nitrate was added to the zeolite so that the adsorption amount of oxides was 3 wt% with respect to 100 wt% of the natural zeolite, and then adsorbed by a wet support method. The adsorbed natural zeolite was heat treated at 400° C. for 1 hour. Through elemental analysis of the adsorbed natural zeolite, it was confirmed that the molar ratio of zinc and copper was 1:1.26.

30 parts by weight of the natural zeolite was mixed with 100 parts by weight of distilled water, followed by forced stirring, and then 2 parts by weight of anhydrous sodium sulfate (Na ₂ SO ₄ ) was added and further stirred to prepare an aqueous dispersion.

A step of manufacturing an unprocessed wood by cutting, pulverizing, or pelletizing a wood raw material, the unprocessed wood was put into an impregnation solution in which zinc and copper-supported zeolite were dispersed, and impregnated to prepare an impregnated wood. In addition, the process of manufacturing the deck board was manufactured by conventional pressing and cutting processing, and for surface processing, the deck board was passed between the heating uneven rolls to form an irregular uneven surface. For product production, mold processing and post-treatment of natural oil application are performed, but for the purpose of physical property testing, test evaluation was performed with a sample of deck boards with concave-convex surfaces.

The physical properties of the deck board according to the manufacturing method of the present invention were measured according to KS F 3230:2013 at the request of the Korea Construction Living Environment Testing Institute. The results are shown in Table 1.

Test Items unit result Flexural load N 6.205 Impact resistance (room temperature) - No cracks and breaks Low impact resistance (low temperature) - No cracks and breaks screw holding force N 991 Slip resistance (C.S.R) - 0.41 Length linear coefficient of thermal expansion 1/℃ 1.3×10-5 lead mg/L non-detection cadmium mg/L non-detection arsenic mg/L non-detection chrome mg/L non-detection Mercury mg/L non-detection Formaldehyde emission mg/L 0.1

From the results of Table 1, all of the physical properties of the deck board manufactured according to the manufacturing method of the present invention appeared to be at the same level as that of the commercially available deck board, indicating that it can be used as a deck board.

In addition, the anti-fungal performance was evaluated for the deck board. The test was performed according to ASTM G 21-15, and strains Aspergillus niger ATCC 9642, Penicillium pinophilum ATCC 11797, Chaetomium globosum ATCC 6205, Gliocladium virens ATCC 9645, Aureobasidium pullulans ATCC 15233 were used. The evaluation criteria are 0 points when no growth of mold is seen with the naked eye or under a microscope, 1 point when no growth of mold is visible with the naked eye but is confirmed under a microscope, the growth of mycelia is insignificant, and the area of the growth part is the total of the sample. If it does not exceed 25% of the area, 2 points, the growth of the mycelium is medium, and the area of the growth part is 3 points if it is 25-50% of the total area of the sample, the mycelium is well developed, and the area of the growth part is When 50 to 100% of the total area of the sample was 4 points, the growth of mycelia was severe and the samples were taken as 5 points when the entire surface was covered. The culture test was conducted for 4 weeks, and the state was evaluated after 4 weeks.

In addition, for comparison, a deck board was manufactured in the same manner as in the example, but in the impregnation solution treatment process, an impregnation solution treated deck board using an aqueous dispersion of copper oxide and zinc oxide powder having an average particle diameter of 0.5 μm as an impregnation solution ( Comparative Example 1), a deck board impregnated with an aqueous dispersion of silver nanoparticles (containing 5 wt% silver) as an impregnating liquid (Comparative Example 2), and carbonized treatment at 240° C. for 30 minutes without treating the preprocessed wood with the impregnating liquid A case of aging, pressing, and cutting processing (Comparative Example 4) was prepared for the deck board manufactured by performing the process of performing the following steps (Comparative Example 3), and the aging, pressing and cutting processing of the preprocessed wood without the impregnation solution treatment process. The results are shown in Table 2.

result Example 0 Comparative Example 1 One Comparative Example 2 One Comparative Example 3 2 Comparative Example 4 4

Looking at the results of Table 2, it can be confirmed that the mold generation of the deck board is severe when the impregnation liquid treatment or carbonization treatment is not performed (Comparative Example 4), but the anti-fungal performance is improved when the impregnation liquid treatment or carbonization treatment is performed on the surface was able to confirm that

In addition, in order to evaluate the anti-fungal performance after long-term use, the deck boards of Examples and Comparative Examples 1 to 3 were left in an external environment for 3 months, and then the anti-fungal performance was evaluated in the same way. The results are shown in Table 3.

result Example 0 Comparative Example 1 3 Comparative Example 2 2 Comparative Example 3 3

Looking at the results of Table 3, when the deck board is left for a long time in an external environment, Comparative Examples 1 to 3 showed a result that the anti-fungal performance was lowered, but in the case of the deck board of the Example, the anti-fungal performance is maintained as it is. could check

Therefore, it was confirmed that the treatment process using the impregnating liquid according to the present invention is effective in improving the anti-fungal performance of the deck board.

In addition, in order to evaluate the antifungal performance according to the type of impregnating liquid, in addition to the example in which zinc oxide and copper oxide-supported natural zeolite were applied to the dispersion, 3 wt% of zinc oxide was supported on the natural zeolite, and then an aqueous dispersion was prepared and impregnated When used as a liquid (Comparative Example 5), after 3 wt% of copper oxide was supported on natural zeolite, an aqueous dispersion was prepared and used as an impregnating liquid (Comparative Example 6) to evaluate the difference. When the anti-fungal performance was evaluated after the deck board was left in the external environment for 3 months, there was no significant difference, but when the anti-fungal performance was evaluated after leaving the deck board in the external environment for 6 months, the anti-fungal performance was 0 in the example. However, in Comparative Examples 5 and 6, the antifungal performance was found to be 2 points and 1 point, respectively. From these results, it was confirmed that a difference occurs in the anti-fungal performance of the deck board depending on the type of support used in the dispersion, and the deck board manufactured when the impregnation process is performed by applying the impregnation solution according to the present invention. It was confirmed that not only physical properties but also antifungal performance were improved.

Although the present invention has been illustrated and described with reference to preferred embodiments as described above, it is not limited to the above-described embodiments and is not limited to the above-described embodiments, and various methods can be made by those of ordinary skill in the art to which the invention pertains without departing from the spirit of the present invention. Transformation and change are possible. Such modifications and variations are intended to fall within the scope of the present invention and the appended claims.

Claims (3)

As a wooden deck board that is treated with an impregnation solution in which zinc and copper-supported zeolite are dispersed, and an irregular uneven surface is formed on one surface,
The deck board is prepared by cutting, pulverizing or pelletizing a wood raw material, put in an impregnation solution in which zinc and copper-supported zeolite are dispersed, impregnated and aged, and then pressurizing, cutting and surface processing the unprocessed wood is manufactured by
The zinc-copper-supported zeolite has a zinc-copper molar ratio of 1:1.26, and is supported so that the adsorption amount of oxides is 3 wt% based on zinc oxide and copper oxide with respect to 100 wt% of the zeolite,
The processed wood is a wood deck board, characterized in that the heat treatment at a temperature of 200 to 250 ℃ wood surface portion of the wood is carbonized treated wood. delete delete