KR100776545B1 - Charcoal board absorbing harmful voc using wood based panel and manufacturing method thereof - Google Patents

Abstract

A carbonized panel capable of being used as a furniture material or an interior material for indoor air purification is provided to be able to remove indoor harmful substances such as formaldehyde and ammonia and unpleasant smell such as cigarette smoke by using wood based panels, and a manufacturing method of the carbonized panel is provided. A manufacturing method of a carbonized panel comprises a carbonization step of charging plate-shaped wood based panels into a carbonizing apparatus to pyrolyze the wood based panels, wherein an internal temperature of the carbonizing apparatus is constantly maintained, a heat insulating material is installed on a wall of the carbonizing apparatus, the carbonizing apparatus is sealed to be isolated from oxygen, and heat resistant load plates are stacked on upper parts of the wood based panels in the carbonization step.

Description

Charcoal board absorbing harmful VOC using wood based panel and manufacturing method

1 is a photograph of a typical laboratory electric furnace

2 is a comparative photograph of a carbon body according to Example 1

Figure 3 is a comparison photograph of the carbon body without applying Example 1

4 is a graph of the weight reduction rate of the MDF carbide board

5 is a graph of thermogravimetric change of untreated MDF

6 is a graph of thermogravimetric change of MDF carbide panel

7 to 10 are photographs of various products to which the MDF carbonization panel of the present invention is applied.

The present invention relates to a harmful VOC adsorption carbonized panel using wood panels and a method of manufacturing the same, and more particularly, to split and deform by a single step of pyrolysis using a wide plate of wood panel such as particleboard, fiber board, etc. as a raw material. The present invention relates to a plate-shaped carbonized panel which is free of charge, and a method of manufacturing such a plate-shaped carbonized panel.

Building materials such as natural coatings, antibacterial agents and photocatalysts that can improve the indoor air of apartments and remove harmful substances are becoming very popular due to sick house syndrome, increased demand for well-being, and related laws.

In addition, bamboo charcoal panels are recently imported from Japan and are being used as wall materials or ceiling materials for apartment construction.

Representative materials used in building finishing materials for this purpose include charcoal, pine needles, silver, jade, loess, elvan, illite, titanium oxide, vermiculite, perlite, tourmaline, roadmite, monozite, and plant essential oils. Raw materials or mineral raw materials are used in various ways.

Among them, charcoal is known for its unique functions such as far infrared ray function, anion function, air purification function, electromagnetic wave blocking function, humidity control function, antibacterial function, adsorption of harmful substances, and is widely known as wallpaper, paper, nonwoven fabric, paint, mortar, coating agent, It is applied to building materials like floor materials and wall materials.

Looking at the materials used in building materials and household containers in recent years, composite molded products are being introduced that mix charcoal with other functional materials such as ocher and jade.In addition, high temperature or room temperature is applied under high pressure by mixing adhesive with charcoal powder. Most products are made by molding.

Prior arts related to the present invention include Korean Laid-Open Patent Publication No. 2000-0054643 and Korean Laid-Open Patent Publication No. 2005-0008255, which have been developed to produce a functional charcoal board composite material while maintaining the properties of charcoal while having a surface makeup effect. It is about.

Most of the existing charcoal panels are manufactured by using charcoal powder and thermosetting adhesive, not by compression molding at room temperature, but by heat compression molding method (heat pressure temperature 170 ℃, heat pressure time 6 minutes). Considering the work process of continuous mass production of charcoal panel molded products, there are many difficulties.

An object of the present invention devised to solve the above problems is to produce a plate-like carbonized panel and a plate-like carbonized panel by a single step of pyrolysis using a wide plate-like wood panel such as particleboard, fiber board, etc. as a raw material. To provide.

It is still another object of the present invention to provide a carbonized panel having no splitting and deformation after production and a method of manufacturing such a plate-shaped carbonized panel.

Another object of the present invention is a carbon panel that can be used as interior materials or furniture materials for indoor air purification that can remove unpleasant odors such as formaldehyde, ammonia, and tobacco smoke using wood panels. It is to provide a method for producing a plate-shaped carbonized panel.

The present invention for achieving the above object is a carbonization panel manufacturing method comprising a carbonization step of thermally decomposing a plate-like wood panel inside the carbonization device.

The temperature inside the carbonization device is kept constant.

In addition, a heat insulating material is installed on the wall of the carbonization device, and the carbonization device is characterized in that it is sealed to block the oxygen.

In addition, the carbonization step is characterized in that the heat-resistant load plate laminated on top of the wood panel.

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Another embodiment of the present invention is a carbonized panel manufactured by the above-described method for manufacturing a carbonized panel, and such a carbonized panel may be used as an interior material or a furniture material for removing VOC.

Hereinafter, the present invention will be described in detail, and detailed descriptions of well-known functions and configurations determined to unnecessarily obscure the subject matter of the present invention will be omitted.

The charcoal forming panel according to the prior art was prepared by mixing charcoal powder with an adhesive and then molding by applying pressure.

However, the present invention is a method for producing a carbonized panel by pyrolysis (carbonization) using a wide plate-like wood panel such as particleboard, fiberboard, plywood, and the like.

Specifically, the temperature inside the carbonization unit is made uniform, and the contact of oxygen is blocked to prevent cracking due to rapid temperature change during carbonization of the wood panel, and to prevent oxidation due to the contact of oxygen, so that the quality is excellent and homogeneous. Carbonized panels having properties can be produced.

In order to make the temperature uniform, it is possible to use a method of maintaining the internal temperature by installing a heat insulator in the carbonization device at the same time as controlling the temperature by external heating.

In order to avoid contact with oxygen, it is possible to use a method of sealing the carbonization unit wall and filling the carbonization unit inside with a gas such as nitrogen gas.

In addition, the wide plate wood panel is easily deformed or split due to the nature of the wood when heated to a high temperature for carbonization.

Accordingly, by splitting a weight plate on the wood panel that does not cause splitting and deformation in the carbonization process, that is, a load capable of suppressing the deformation, the splitting and deformation of the carbonization panel can be prevented. Can be.

In addition, since the weight plate is capable of heat conduction directly to the wood panel, it is possible to compensate the uniform heating of the wood panel through heat transfer by such heat conduction.

As such a weight plate, a high heat resistant flat plate such as an iron plate, a stainless plate, a ceramic plate, or a silicon carbide plate can be used.

The carbonization panel manufactured by the above method can be cut to any size and used as a material for adsorbing indoor harmful substances such as formaldehyde and ammonia.

In addition, the carbonization panel has a high adsorption property and can be utilized as various products for indoor air purification to remove unpleasant odors emitted from wood products or household goods such as tobacco smoke and meat smell.

Therefore, it can be used as a material for furniture, such as interior decoration or desk, jangnon.

Of course, since the carbonized panel is carbonized, the brittleness becomes large and can be easily broken.

Therefore, it is also possible to attach and use other wood panels.

Manufactured lightweight carbide boards have heat resistance up to 400 ° C. and do not generate flame even at temperatures above 400 ° C. In addition, the adsorption to harmful chemicals such as formaldehyde and ammonia is very high, so it can be used to remove harmful chemicals such as formaldehyde of wood products and household goods such as sinks, furniture, bookshelves, etc. It can be used as a variety of products.

Example 1

Commercially available medium-density fiberboard (MDF) is prepared in two groups of 3mm, 4.5mm, 6mm, and 18mm thickness, cut into 5cm × 15cm, and cut into 400cm, 500, 600, 700, Carbon bodies were prepared under temperature conditions of 800, 900, and 1000 ° C.

At this time, one tank was packed in several layers of aluminum foil in advance and put in a heat-resistant container (width 15 × height 20 × height 10 cm) before putting each specimen into an electric furnace to reduce splitting during the carbonization of MDF. The empty space of the container was filled with quartz sand to cut off the contact of oxygen as much as possible to minimize splitting.

And warping was prevented by applying a moderate load to the plate-shaped heat-resistant plate on the upper and lower parts of each test piece. The arrival time of each temperature was set to 4 hours, held for 2 hours and then naturally cooled.

As shown in FIG. 2, splitting and distortion inevitably occur without the treatment according to the present invention. However, when the present invention is applied, the splitting and the distortion can be prevented.

Example 2

A carbon body was prepared under the same conditions as in Example 1. At this time, the shrinkage ratio and the weight loss ratio of the MDF carbide boards were examined.

Shrinkage by direction of the 3mm thick MDF carbide plate according to the present invention is 14% (400 ℃) ~ 25% (1,000 ℃) in the horizontal direction, 13% (400 ℃) ~ 25% (1,000 ℃) in the longitudinal direction, 28% in the thickness direction (400 ° C.) to 46% (1,000 ° C.), and the weight loss rate was 63% (400 ° C.) to 74% (1,000 ° C.).

In addition, the shrinkage rate for each direction of the 4.5 mm thick MDF carbide plate to which the present invention is applied is 14% (400 ° C) to 25% (1,000 ° C) in the horizontal direction, 12% (400 ° C) to 25% (1,000 ° C) in the longitudinal direction, The thickness direction was 34% (400 ° C.) to 47% (1,000 ° C.), and the weight reduction rate was 66% (400 ° C.) to 76% (1,000 ° C.).

In addition, the shrinkage rate by direction of the 6 mm thick MDF carbide plate according to the present invention was 14% (400 ° C) to 25% (1,000 ° C) in the horizontal direction, 12% (400 ° C) to 25% (1,000 ° C) in the longitudinal direction, The thickness direction was 28% (400 ° C.) to 48% (1,000 ° C.), and the weight reduction rate was 67% (400 ° C.) to 76% (1,000 ° C.).

Moreover, the shrinkage | contraction rate according to the direction of the thickness 18mm MDF carbide board which applied this invention is 10% (400 degreeC)-25% (1,000 degreeC) of horizontal direction, 10% (400 degreeC)-21% (1,000 degreeC), thickness in a longitudinal direction, and thickness. Aromas were 32% (400 ° C.) to 40% (1,000 ° C.) and weight loss rates were 65% (400 ° C.) to 77% (1,000 ° C.).

Comparative Example 1

In Comparative Example 1, a carbon body was prepared by inserting a 6 mm thick MDF sample into a heat-resistant container (15 x 20 x 10 cm in height) with a lid without applying the present invention described above, unlike Example 2. At this time, the shrinkage and weight loss ratios of the MDF carbide boards were investigated.

Shrinkage by direction of the MDF carbide plate without applying the present invention was 20% (400 ℃) ~ 30% (1,000 ℃) in the horizontal direction, 18% (400 ℃) ~ 30% (1,000 ℃) in the longitudinal direction, thickness direction 28% (400 ° C.) ~ 48% (1,000 ° C.) and weight loss rates ranged from 67% (400 ° C.) to 76% (1,000 ° C.). If the present invention is not applied, as shown in FIG. 3, splitting, twisting, and splitting were severely generated in the horizontal and vertical directions, and pieces were broken into pieces.

The shrinkage in the thickness direction and the weight loss rate did not change significantly regardless of whether the present invention was applied or not.

Example 3

Toxic gas removal experiments on formaldehyde and ammonia were carried out on the MDF carbonization panel applying the present invention prepared in Example 1.

Formaldehyde is a chemical that is carcinogenic and is released slowly over many years in places where amino-based adhesives such as sinks, furniture, wallpaper, floorboards, etc. are used, and it is mandatory to measure indoor air quality as the main culprit of sick house syndrome.

Ammonia is known as the cause of cement poisons and is highly alkaline and is known as a chemical causing various diseases such as atopy.

  A test piece of 4 cm x 4 cm x 1 cm in thickness was placed in a 10 L desiccator, and the concentration of formaldehyde and ammonia gas was injected.

The removal rate was calculated taking into account the natural rate of reduction of the gas by blank. As shown in the results of Table 1 and Table 2, 90% of formaldehyde and ammonia were removed at 30 minutes, indicating that the initial removal rate was very high.

After 120 minutes, about 96% of formaldehyde was removed and 95% of ammonia was removed, resulting in a lower gas concentration over time. In conclusion, carbonized panels made of wood panels such as MDF have high adsorption rate for harmful chemicals such as formaldehyde.

Formaldehyde Removal Rate of MDF Carbide Panels Elapsed time (minutes) Blank concentration (ppm) Sample concentration (ppm) % Removal 0 81 81 - 30 78 7 91.0 60 75 5 93.3 90 72 4 94.4 120 70 3 95.7

Ammonia Removal Rate of MDF Carbonization Panel Elapsed time (minutes) Blank concentration (ppm) Sample concentration (ppm) % Removal 0 200 200 - 30 176 18 89.8 60 169 13 92.3 90 152 9 94.1 120 145 7 95.2

Example 4

The weight change by the thermogravimetric analyzer (TA Instrument, SDT-Q600, USA) was investigated for the MDF carbonization panel to which the present invention manufactured in Example 1 was applied.

Thermogravimetric analysis was also performed on the uncarburized MDF to examine the heat resistance of the carbonized panel.

As shown in FIG. 5, the untreated MDF started pyrolysis at about 250 ° C. and 50% of the weight was reduced at about 350 ° C. to complete the pyrolysis at about 550 ° C. after the inflection point.

However, in the case of the MDF carbonization panel, as shown in FIG. 6, when the temperature reaches around 320 ° C., the gentle pyrolysis starts, and 50% of the weight decreases around 510 ° C., and slowly pyrolysis is completed near the temperature of 600 ° C. without obvious inflection point. It became.

MDF carbonization panel has a higher heat resistance than MDF and also does not emit toxic smoke and flames during the pyrolysis process, the carbonization panel to which the present invention is applied is a safe fireproof material having heat resistance.

The appearance of the MDF or PB carbonization panel manufactured by applying the present invention can be commercialized in various ways to prevent the charcoal on the surface of the hands by techniques such as water washing, color coating, embossing, perforation, veneer, film attachment. (See FIGS. 7 and 8)

In addition, the carbon panel having various colors and patterns can be used in various fields for adsorbing harmful substances such as formaldehyde. For example, it can be used as a member or insert of a ceiling board, a wall board, a floor board, a picture frame, a floor board, a sink, a furniture, a bookcase, etc. to accomplish this function (see FIGS. 9 and 10).

Of course, this technology includes functions such as far infrared rays, anions, antimicrobial activity, electromagnetic shielding, air purification, oxidation prevention, humidity control, heat storage, condensation prevention, etc. .

As described above, the present invention has been described in detail, but those skilled in the art will understand that various modifications and changes can be made without departing from the spirit and scope of the invention as set forth in the claims below. Could be.

By using the carbonized panel drawn through the present invention, it is possible to mitigate the ammonia toxicity of formaldehyde and cement contained in the interior building finishing materials, such as conventional sink panels, furniture panels, ceiling panels.

In addition, the carbonization panel can provide fresh air for improving the health of people in buildings by removing harmful smells such as meat smell, tobacco smoke, and contribute to human health by releasing a large amount of far infrared rays.

In addition, the carbonized panel of the present invention is very simple compared to the charcoal forming panel manufacturing process according to the prior art, there is little shrinkage, expansion by moisture, and is a lighter material than the conventional charcoal forming panel due to the reduced moisture content.

In particular, regardless of the use of traditional charcoal kiln or electric furnace, it is possible to manufacture a wide plate of carbon panel without splitting and deformation, so that it can be produced in large quantities, the industrial value is very high.

Unlike the existing charcoal molded article according to the present invention is composed of only 100% char is not mixed with other mixtures, such as organic matter, inorganic matter, adhesives. Therefore, there is no emission of an unpleasant odor in the carbonized panel, and the adsorption effect is excellent due to the high content of charcoal.

Claims (7)

A carbonization step of charging and decomposing a plate-like wood panel inside a carbonization device, wherein the temperature inside the carbonization device is kept constant, and an insulation is installed on the wall of the carbonization device, and the carbonization device is blocked from oxygen. The carbonized panel manufacturing method, characterized in that the heat-resistant load plate is laminated on the top of the wood panel in a closed, carbonized step. delete delete delete delete Carbonization panel manufactured by the method of manufacturing a carbonization panel of claim 1. Method of using the carbonized panel of claim 6 as interior materials or furniture materials for VOC removal.

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