KR100945180B1 - Processing method of bambusoideae - Google Patents

Abstract

PURPOSE: A processing method for bamboos is provided to reduce the time of heating process without a separate heater, and to efficiently remove and sterilize the surface of the bamboos in five minutes using a sodium hypochlorite solution. CONSTITUTION: A processing method for bamboos comprises the following steps of: applying a sodium hypochlorite solution on the surface of the bamboos for 1~3 minutes at room temperature; washing the bamboos applied with the sodium hypochlorite solution with water; heating and drying the washed bamboos for 10~30 minutes at 60~150 deg C using a microwave selected from the group consisting of a 915MHz microwave and a 2.45GHz microwave; and applying a silicon emulsion coating containing 2-ethoxyethanol 5~15 parts by weight, N-butanol 1~10 parts by weight, colloidal silica 1~10 parts by weight, sorbitan mono-oleate 10~30 parts by weight, and distilled water 300~350 parts by weight based on 100 parts by weight of the isobutyl trimethoxysilane on the dried bamboos.

Description

Processing Method of Bambusoideae

The present invention relates to a bamboo processing method, and more particularly, to a bamboo processing method that does not discolor, deteriorate, and corrode due to ozone, acid rain, etc., even when the natural texture of bamboo is fully expressed and exposed to outdoor for a long time.

Bamboo (Bambusoideae) is a generic name of a monocotyledonous rice plant (rice) and an evergreen perennial plant belonging to the bamboo subfamily, which is distributed worldwide but mainly grows in the tropics, especially in Asian monsoon zones.

In general, bamboo has excellent durability and modulus of elasticity, and thus has a wide variety of uses, ranging from building materials, furniture, fishing rods, plant supports, and basketwork such as baskets, and is often used for ornamental purposes.

However, when these bamboos are manufactured with outdoor landscaping facilities such as bollards, garden lamps, fences, road dividers, rose arches, pagora, benches, etc., they are prone to cracking during the drying process. The coating film or paint coating film is likely to be peeled off, deteriorated, and corroded, and mold is easily generated, resulting in a very short service life.

To solve these problems, various methods of processing bamboo have been developed.

For example, Korean Patent No. 2001-0003727 relates to a method for processing antimicrobial bamboo, which is placed in a mixed bleach solution of 1.5: 1 to 2: 1 of 10% hydrogen peroxide solution and 1% NaOH solution and boiled for 20 to 60 minutes. Disclosed is a bamboo processing method comprising the steps of bleaching and washing the bleached bamboo with 1% HCl solution to neutralize it.

However, Patent Publication No. 2001-0003727 has a problem that it is not environmentally friendly by using a large amount of environmentally harmful substances during bamboo processing by a process of neutralizing with hydrochloric acid.

And, Patent Publication No. 1999-0075975 is a manufacturing method of the panel (PANNEL) in the building using bamboo, and put the bamboo material and the auxiliary barrel in the water containing the fruit bleach and the dye, about 20 at a temperature of 100 ℃ or more It includes a process for sterilizing, bleaching and dyeing the processed bamboo materials by boiling for about 40 minutes, and also provides a method for coloring a bamboo by heat treatment and a bamboo product manufactured by the method. And, characterized in that it comprises the step of heat-treating bamboo for 1 hour to 2 hours at a temperature of 175 ~ 240 ℃ in a vacuum furnace.

However, since the bamboo is discolored to dark brown, brown, etc. by heat treatment such as heating, there is a problem that there is no natural texture of bamboo for use as an outdoor landscaping facility, and high cost in working by long time heat treatment and heat treatment mechanism. .

In addition, the majority of bamboo processing methods, such as registered Patent No. 10-0622028, heats and carbonizes, colorizes, or sterilizes the bamboo, but since it is artificially carbonized and colored by heat treatment, the natural texture of the bamboo was not felt. In addition, it is difficult to safely remove the sap contained in the skin of the bamboo, so that discoloration and decay of the bamboo is likely to occur over time.

In other words, if the sap is not completely removed from the bamboo skin, the coating agent is poorly adhered due to poor adhesion, and the sap forms pores due to temperature change, and thus sap is easily formed by rainwater, moisture, corrosion, and aging. This is shortened.

Therefore, the conventional bamboo can be used for indoor, craft, furniture, and the use is very limited, but also outdoor for strong durability and long-term storage resistance that does not deteriorate, corrode, and decay even when exposed to moisture, air exposure, rainwater, etc. Bamboo products as landscaping facilities were not available. In order to solve this problem, the surface of the bamboo is used by painting with paint, but it is also a situation that cannot be utilized as an outdoor landscaping facility due to peeling, aging, and corrosion in a short time.

In order to solve the problems as described above, an object of the present invention is to provide a bamboo processing method of expressing the natural texture of bamboo as much as possible, and is not deteriorated and corroded by ozone, acid rain and the like and improved durability and long-term storage.

The above object is a step of treating the surface of the bamboo with sodium hypochlorite solution for 1-3 minutes, washing the surface-treated bamboo with water, heating and drying the washed bamboo using microwave and It is achieved by a bamboo processing method comprising the step of applying a coating on the surface of the dried bamboo.

Preferably, the microwave is selected from the group consisting of 915 MHz microwave, 2.45 GHz microwave, and combinations thereof.

Also, preferably, the heat drying step is performed at a temperature of 60 to 150 ° C. for 10-30 minutes.

Also preferably, the sodium hypochlorite solution has a concentration of 12% to 90% (v / v).

Also, preferably, the coating agent is selected from the group consisting of acrylic urethane, lacquer, cashew, silicone coating agent, titanium coating agent, silicone emulsion coating agent, fluorine emulsion coating agent, sol-gel coating agent and nanocoating agent.

In addition, preferably, the coating agent is a silicone emulsion coating agent, based on 100 parts by weight of isobutyl rimethoxysilane, 5 to 15 parts by weight of 2-ethoxyethanol, 1 to 10 parts by weight of n-butanol, and 1 to 1 colloidal silica It is characterized by consisting of 10 parts by weight, 10-30 parts by weight of sorbitan monooleate, 300-350 parts by weight of distilled water.

According to the present invention, when bamboo having excellent durability and elasticity as an outdoor landscaping facility is exposed to prolonged exposure, it is not deteriorated, corroded or rotted by ozone, acid rain, etc., and can prevent scratches and cracks, and maximize the natural texture of bamboo. Because it can express, its utilization is very high.

In addition, according to the bamboo processing method of the present invention, without the need for a separate heating means or a long time work, using a sodium hypochlorite solution to clean the foreign matter of the bamboo surface, sap of the epidermis, mold, etc. in less than 5 minutes simply Can be removed and sterilized, economical in terms of cost and time of operation. In addition, the drying time by using microwave can significantly shorten the drying time, prevent cracking of the bamboo, and evenly dry the inside of the bamboo, protect the scratches from external impact, and also provide the sterilization effect There is this.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

1 is a view schematically showing a bamboo processing method according to the present invention, Figure 2 is a view showing a surface of the bamboo processed in accordance with the bamboo processing method of the present invention sequentially.

The present invention provides a bamboo processing method comprising the steps of treating the surface of the bamboo with sodium hypochlorite solution for 1-3 minutes, washing the surface-treated bamboo with water, and drying the washed bamboo using microwaves And applying a coating to the surface of the dried bamboo.

First, the surface of bamboo is surface treated with sodium hypochlorite (NaOCl) solution for 1 to 3 minutes. Sodium hypochlorite is also called sodium hypochlorite (NaOCl), and is widely used as a bleach, oxidizing agent, disinfectant disinfectant, bleach and deodorant. When the sodium hypochlorite solution is used for the surface treatment of bamboo, it is excellent in removing the foreign substances, the sap of the epidermis and the mold on the surface of the bamboo, and at the same time, sterilizing the epidermis of the bamboo. Preferably, as the sodium hypochlorite solution, the concentration of the sodium hypochlorite solution is 12% or more and 90% (v / v) or less.

If the sodium hypochlorite solution is kept wet for 1 to 3 minutes by applying, spraying or dipping the bamboo surface with a brush, spray, the sap of the foreign matter, contaminants and epidermis on the bamboo surface and the reaction with sodium hypochlorite Dissolves and is removed cleanly. Thereafter, the bamboo surface treated with sodium hypochlorite solution is washed with water to completely remove the residue on the bamboo surface.

As described above, when the surface treatment of bamboo is performed with sodium hypochlorite solution, we remove the foreign substances, the sap of the epidermis, the mold, etc. on the surface of the bamboo with sterilization and sterilization, and apply wettability when coating the coating through bamboo drying process. It improves wettability, improves adhesion, and can increase durability life outdoors, and can completely remove residual sap in bamboo skin to improve adhesion of coatings.

The washed bamboo is then heat dried using microwaves. Preferably, the heat drying using microwaves is carried out for 10-30 minutes at a temperature of 60 to 150 ℃. Any method of drying may be used for drying the washed bamboo, but when using a hot air balloon drying device using an electric heater, gas, oil burner, etc., since the direction of heat is applied from the surface of the bamboo, heat drying It takes a long time as less than 1-2 hours, as much as 3-4 hours, less time is consumed due to drying, there is a problem in the case of the bark and the color change occurs to reduce the value of the commodity.

Preferably, the bamboo processing method according to the present invention uses a microwave drying apparatus. In the case of microwaves, it penetrates evenly and uniformly into the epidermis, mesothelial and endothelium of the bark and absorbs moisture from inside and outside directly, allowing it to be heated by heating, and the drying time is 10-30 minutes. Because it can be shortened much, the splitting or discoloration of the bark by heating does not occur.

The microwave used in the present invention is an Industrial Scientific Medical (ISM) frequency band used for industrial purposes, which is used at 915 MHz, 2.45 GHz, or a combination of the two frequencies. Although 915 MHz microwaves penetrate inside of both 2.45 GHz microwaves and increase the temperature inside, 915 MHz microwave energy is relatively weak and easily penetrates to the inside. Although the penetration rate is low, but the heating time is short, it is more preferable to use a combination of the two microwaves properly.

For reference, the way in which the microwave heats the material is that a polar dielectric such as water molecules absorbs the microwave and rotates at high speed or is heated by ionic condution. The heating rate is determined by the dielectric properties of the target material. Among the dielectric properties, the dielectric constant of the material indicates the storage capacity of electrical energy, and the loss factor (Dielctric loss factor) can convert and consume the electrical energy into thermal energy. The higher this value is, the easier it is to heat up. Microwave also has the advantage of very high energy conversion efficiency. Using this principle, the bark could be dried without cracking by sterilization and heating.

 Dielectric constant Material Dielectic constant (2.45 GHz) Material Dielectic constant (1.0 GHz) Hexne     1.89 Polybutene    2.8 Benzene     2.27 Polystyrene    2.3 Ethanol     25.0 Polypropylene    2.6 Water     78.54 Natural rubber    2.4

Table 1 shows the dielectric constants described in Food Science and Industry 31, No. 1 (1998), CRC Handbook. As shown in Table 1, the water has a very high dielectric constant of 78.54 at 2.45 GHz, so that it can heat both the outside and the inside of the tree at the same time, allowing the tree to dry quickly.

Therefore, the conventional drying method should be heat dried 1-2 hours, but when applying the microwave according to the present invention by heating at 60 ℃ to rise to 5 ℃ / min 10-30 minutes by heating to dry up to 150 ℃ Not only can the same effect be obtained, but also the splitting and discoloration of the bark tree can be prevented and the bactericidal effect is given. In this case, the drying time increases when the temperature is lower than 60 ℃, and the drying time is not efficient.The drying time is shortened when the temperature is higher than 150 ℃, but the surface of the bamboo discolors according to the heating temperature. Can happen. Therefore, it is most preferable to maintain the heating temperature of 60 to 150 degreeC.

Thereafter, a coating agent is applied to the surface of the dried bamboo. The reason for applying the coating agent is to prevent or delay prolonged aging and corrosion due to ultraviolet rays, acid rain, sunlight, moisture, and the like. Bamboo according to the present invention is not colored and discolored, the surface of the bamboo when the transparent coating is applied can express a natural texture, and may also be coated in various color to improve the aesthetics. Thus, the coating agent according to the invention is transparent or colored.

Coatings used in bamboo coatings include paints. As the coating agent or paint used in the present invention, an epoxy primer, an acrylic primer, a polyester primer, a fluororesin, a silicone, and a titanium may be used, and an acrylic urethane, lacquer, cashew, silicone-based coating agent, titanium-based coating agent, silicone Preference is given to using emulsion coatings, fluorine-based emulsion coatings, sol-gel coatings and nanocoatings. In particular, silicone emulsion coatings and fluorine-based emulsion coatings are preferable in terms of environment-friendliness, and sol-gel coatings and nano coatings are preferable in terms of durability. Here, the silicone emulsion coating agent, the sol-gel coating agent and the nanocoating agent are preferably heat-dried at a temperature of 150-180 degrees for 5-30 minutes.

As the most preferred coating agent used in the present invention, a silicone emulsion coating agent is used, and in the case of the silicone emulsion coating agent, 5 to 15 parts by weight of 2-ethoxyethanol based on 100 parts by weight of isobutyltrimethoxysilane, n-butanol 1 It is preferable that it consists of -10 weight part, 1-10 weight part of colloidal silica, 10-30 weight part of sorbitan monoolate, and 300-350 weight part of distilled water.

In the case of paint, it is also possible to dry naturally after application. Dry completely and leave to dry for 30 minutes to 24 hours.

Hereinafter, the present invention will be described in more detail with reference to Examples. These examples are only for illustrating the present invention in more detail, it will be apparent to those of ordinary skill in the art that the scope of the present invention is not limited by these examples in accordance with the gist of the present invention. .

Experimental Example 1: Surface treatment effect of sodium hypochlorite according to the present invention

Sodium hypochlorite 12% solution (example), which is a surface treatment agent according to the present invention, and sodium hydroxide (comparative example 1), hydrogen peroxide (comparative example 2), and hydrochloric acid (comparative example 3) generally used for bamboo surface treatment The surface treatment effect of bamboo was compared. Each surface treatment agent was applied to the surface of the bamboo with a brush, and the results of comparing the surface of the bamboo over time are shown in Table 2 below.

Effect of Chemicals on Bamboo Surface Treatment Drug name 1 minute later 2 minutes later 3 minutes later Sodium Hypochlorite (Examples) Start dissolving foreign substances, contamination, epidermal sap Remove foreign substances, contamination, epidermal sap Remove foreign substances, contamination, epidermal sap NaOH (Comparative Example 1) no effect no effect no effect H ₂ O ₂ (Comparative Example 2) Decolorization reaction, Decolorization Decolorization HCl (Comparative Example 3) Discolored Discolored Discolored

According to Table 2, after about 30 seconds when the 12% solution of sodium hypochlorite (example) according to the present invention was applied to the bamboo surface, the reaction with the foreign substances, contaminants, and epidermal sap proceeded about 2 minutes. Although the substance was completely removed, the surface of bamboo was discolored or discolored in the case of hydrogen peroxide (Comparative Example 2) and hydrochloric acid (Comparative Example 3), and it was found that sodium hydroxide (Comparative Example 1) had no effect on the surface treatment. Could.

Experimental Example 2: Adhesiveness at Surface Treatment with Sodium Hypochlorite Solution

When the bamboo is coated with acrylic urethane, cashew, silicone emulsion coating agent and silicone sol-gel coating agent, and after the surface treatment of bamboo with 12% solution of sodium hypochlorite (example), acrylic urethane, cashew, silicone emulsion coating agent And adhesion experiments when coated with a silicone sol-gel coating. The experimental results are shown in Table 3 below.

Adhesive test designation No surface treatment Surface Treatment (Sodium Hypochlorite) Remarks Acrylic urethane Peeling No peeling off, good adhesion Nails, Pencils2H Cashew Peeling No peeling off, good adhesion Nails, Pencils2H Silicone Emulsion Coating Agent Partially coated Front coating, good adhesion Nails, Pencils2H Silicone Sol-Gel Coating Agent Partial coating, peeling Front coating, good adhesion Nails, Pencils2H

As can be seen in Table 3, when the coating agent was applied without surface treatment with a 12% solution of sodium hypochlorite, only a partial coating, peeling or peeling of the coating film was observed, but with sodium hypochlorite according to the present invention. When the surface treatment is performed and the coating agent is applied, it can be seen that the coating agent is easily applied to improve adhesiveness and thus is not easily peeled off or peeled off.

Experimental Example 3. Microwave Heat Drying Comparison Test

After the surface treatment of the bamboo, when drying by heating, the heating and drying using a microwave and a general heater hot air drying according to the present invention was performed by 100 each, and the results are shown in Table 4.

Heater hot air drying Microwave heat drying Heating heating time 60 ℃ -150 ℃ warming Crack (38/100), Surface Discoloration Light Brown No abnormality, surface primary color Heater Hot Air: 90 minutes Microwave: 15 minutes 150 ℃ -210 ℃ Crack (64/100), discoloration dark brown No abnormality, surface discoloration light brown Heater Hot Air: 130 minutes Microwave: 30 minutes

When heated to 60 ℃ -150 ℃ when the heater was heated, it showed cracking phenomenon in 38 bamboos among 100 bamboos, and when warming up to 150 ℃ -210 ℃, it cracked in 64 bamboos among 100 bamboos. In addition, it was found that the higher the heating temperature, the greater the discoloration of the surface. However, no microwave phenomenon occurred during microwave heating and drying. When warmed at a temperature of 60 ° C.-150 ° C., the primary color of bamboo was maintained without discoloration of the surface. However, despite the high temperature at 150 ° C-210 ° C heating during microwave heating drying, there was no cracking because the drying time was shortened, but the surface was light brown. The most preferred microwave heating drying time was found to be 60 ℃ -150 ℃.

For reference, bamboo used as outdoor landscaping facilities is usually used as a traditional bamboo, so if cracking or discoloration occurs during the drying process, the durability of the bamboo will be lowered and the value of the product will be lost. Microwave heat drying at 60 ° C.-150 ° C. to maintain the temperature is particularly important. In addition, when the heater hot air is dried, it takes at least 1 to 4 hours to complete drying, but the microwave drying of the present invention takes a short time of about 10 to 30 minutes, thereby significantly reducing the working time. .

Experimental Example 4: Coating effect of the coating

Silicone emulsion coatings were used as preferred coatings of the invention. Silicone emulsion coatings were prepared by the following formulation ratios. The silicone emulsion coating was coated on the dried bamboo, and naturally dried for at least 1 hour and then forced to dry at 100 ° C for 5 minutes.The surface of the bamboo retained its primary color, exhibited the natural texture of bamboo, and was immersed or sprayed in water. The water did not get wet at all, indicating that the water resistance was excellent. In addition, after heating the gear oven for 30 minutes at a temperature of 120 degrees, the water-repellent and waterproof properties were good even in the immersion test, the coating film was not peeled off or the scratch-resistant test (nail, pencil 2H) was good and the natural texture of the bamboo was maintained.

Silicone Emulsion Ratio

Isobutyltrimethoxysilane: 100 g

2-ethoxyethanol: 7.0 g

n-butanol: 5.0 g

Colloidal silica: 5.0 g (Nalcock 1115, manufactured by Nalcock Chemical Co., Ltd.)

Sorbitan monooleate: 20 g

Distilled Water: 320 g

1 is a view schematically showing a bamboo processing method according to the present invention.

2 is a view showing the surface of the bamboo processed in accordance with the bamboo processing method of the present invention sequentially.

Claims (6)

As a bamboo processing method, Applying sodium hypochlorite solution on the surface of bamboo at room temperature for 1-3 minutes; Washing the bamboo to which the sodium hypochlorite solution is applied; Heat drying the washed bamboo at a temperature of 60 to 150 ° C. for 10-30 minutes using microwaves selected from the group consisting of 915 MHz microwaves, 2.45 GHz microwaves, and combinations thereof; And 5 to 15 parts by weight of 2-ethoxyethanol, 1 to 10 parts by weight of n-butanol, 1 to 10 parts by weight of colloidal silica, and sorbitan based on 100 parts by weight of isobutyltrimethoxysilane on the surface of the dried bamboo Bamboo processing method comprising the step of applying a silicone emulsion coating agent consisting of 10 to 30 parts by weight of monoolate and 300 to 350 parts by weight of distilled water. delete delete The method of claim 1, wherein the sodium hypochlorite solution has a concentration of 12% to 90% bamboo processing method. delete delete

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